Best Heat Pumps in the USA: Complete Buying Guide, Technologies, Technical Specifications

Quick Answer: Which Heat Pump Technology Should You Choose?

There is no single heat-pump model that is appropriate for every American home. The correct selection depends heavily on climate, heating load, ductwork, electricity rates, fuel availability and the specific matched indoor/outdoor equipment combination.

What Is a Heat Pump?

A heat pump is a thermodynamic machine that transfers heat rather than creating most of its heating output directly through combustion or electrical resistance.

In heating mode, the outdoor heat exchanger acts as the evaporator. Refrigerant circulating through the outdoor coil absorbs heat from the outdoor environment. The compressor raises the refrigerant pressure and temperature. The hot refrigerant then travels to the indoor heat exchanger, where it releases heat into the home.

The cycle can be reversed through a reversing valve. In cooling mode, the indoor coil absorbs heat from the house and the outdoor coil rejects that heat outside.

Mathematically, the useful heating relationship can be expressed as:

Q_heating = Q_{outdoor source} + W_compressor

where Q_heating is the heat delivered indoors, Q_{outdoor source} is heat extracted from the outdoor environment and W_compressor represents electrical work supplied to the compressor and associated equipment.

This is why a heat pump can deliver more heat energy to a home than the electrical energy directly consumed by the compressor. The additional thermal energy is transferred from the environment.

How a Heat Pump Works

The Four Basic Refrigeration Processes

1. Evaporation: Low-pressure refrigerant absorbs heat and evaporates.
2. Compression: The compressor raises refrigerant pressure and temperature.
3. Condensation: The hot refrigerant releases heat and condenses.
4. Expansion: The expansion device reduces refrigerant pressure and temperature so the cycle can repeat.

The compressor is therefore one of the most important components in the system. Modern variable-speed heat pumps use inverter-driven compressors that can change operating speed rather than repeatedly switching completely on and off.

Why Reversing Valves Matter

A reversing valve changes the direction of refrigerant flow through the heat exchangers. In heating mode, the outdoor coil extracts heat and the indoor coil releases it. In cooling mode, their roles are reversed.

The result is a single refrigeration system capable of both heating and cooling.

Why Can a Heat Pump Produce Heat When It Is Cold Outside?

Cold outdoor air still contains thermal energy. The important question is not whether outdoor air is colder than the indoor air, but whether the refrigerant in the outdoor heat exchanger can be maintained at a temperature sufficiently below the outdoor air to absorb heat.

As outdoor temperature falls, however, the temperature difference available to the refrigeration cycle changes. Compressor work generally increases, heating capacity can decline, and efficiency can decrease.

This is one reason the phrase “works down to -13°F” should not automatically be interpreted as meaning that the heat pump produces its full rated heating capacity at -13°F.

Low-temperature performance must be examined using actual capacity and efficiency data at the relevant outdoor temperature.

Types of Heat Pumps in the USA

Air-Source Heat Pumps

Air-source heat pumps use outdoor air as their thermal source in heating mode and heat sink in cooling mode.

They are the most practical heat-pump technology for many existing American homes because they do not require drilling or excavation for a ground loop.

The major air-source configurations are:

• Ducted split systems
• Ductless single-zone mini-splits
• Ductless multi-zone systems
• Packaged heat pumps
• Dual-fuel heat-pump systems

ENERGY STAR’s current residential criteria distinguish split and single-package systems and use SEER2, EER2 and HSPF2 as key efficiency metrics. Current ENERGY STAR split-system criteria are at least 15.2 SEER2, 11.0 EER2 and 7.8 HSPF2 for standard qualifying heat pumps. Cold-climate systems have additional requirements. Source: ENERGY STAR.

Ducted Heat Pumps

A ducted heat pump normally consists of an outdoor heat-pump unit and an indoor air handler or compatible furnace/coil assembly.

The indoor blower circulates conditioned air through supply and return ducts.

Advantages

• Uses an existing forced-air distribution system.
• Can condition the entire house through existing registers.
• Can integrate with a backup furnace.
• Can use communicating thermostats and variable-speed equipment.
• Provides both heating and cooling.

Potential Problems

• Leaky ducts reduce delivered efficiency.
• Improperly sized ducts can restrict airflow.
• Old duct systems may require sealing or modification.
• Oversizing the heat pump can cause poor cycling and comfort.
• Indoor and outdoor equipment must be correctly matched.

Ductless Mini-Split Heat Pumps

Ductless systems eliminate the need for conventional whole-house air ducts. Refrigerant piping connects the outdoor heat-pump unit to one or more indoor units.

A single-zone system has one outdoor unit and one indoor unit. Multi-zone systems can connect several indoor units to one outdoor unit, although the allowable number and combinations depend on the manufacturer and model.

Mitsubishi, for example, currently offers single-zone, multi-zone, ducted and ductless configurations, including Hyper-Heating systems designed for cold weather. Some of its multi-zone systems can connect multiple indoor units to one outdoor unit. Source: Mitsubishi Electric HVAC US.

Advantages

• No conventional duct network is required.
• Excellent zoning capability.
• Useful for older homes and additions.
• Can provide heating and cooling to individual rooms.
• Inverter compressors can modulate capacity.

Limitations

• Indoor wall-mounted units are visible.
• Multiple rooms may require several indoor units.
• Installation requires proper refrigerant piping and condensate management.
• Improper sizing can cause cycling or inadequate heating.

Cold-Climate Heat Pumps

Cold-climate heat pumps deserve special attention because conventional seasonal ratings do not tell the whole story.

Under the current ENERGY STAR specification, a residential split heat pump seeking the Cold Climate designation must meet higher heating-efficiency requirements and demonstrate low-temperature performance. For ducted split systems, the current minimum is 15.2 SEER2 and 8.1 HSPF2. For non-ducted split systems, the minimum HSPF2 is 8.5.

ENERGY STAR also requires a Cold Climate model to demonstrate a coefficient of performance of at least 1.75 at 5°F and retain at least 70% of its 47°F heating capacity at 5°F, subject to the specified testing and controls procedures.

This distinction is extremely important when comparing heat pumps for northern climates.

ENERGY STAR’s current Cold Climate specification provides these requirements. Source: ENERGY STAR, current residential heat-pump specification.

Dual-Fuel Heat Pumps

A dual-fuel system combines an electric heat pump with a gas furnace or another combustion heating source.

During conditions where the heat pump can provide heat economically and adequately, the heat pump can operate. Under other conditions, the system can switch to the furnace.

The switching point is often described using terms such as balance point or economic balance point, but the actual control strategy depends on the equipment and thermostat.

Why Consider Dual Fuel?

• Existing furnace can remain part of the system.
• Provides an additional heating source.
• Can reduce reliance on electric resistance backup.
• Useful where gas infrastructure already exists.

Dual-fuel operation should be evaluated using local electricity and fuel prices rather than assuming that one fuel is always cheaper.

Geothermal Heat Pumps

Geothermal or ground-source heat pumps exchange heat with the ground rather than directly with outdoor air.

The ground temperature several feet below the surface changes much more slowly than outdoor air temperature. This can give geothermal systems a relatively stable thermal source and sink.

Main Ground-Loop Configurations

• Horizontal loop
• Vertical loop
• Pond/lake loop
• Open-loop groundwater systems

The main disadvantage is installation complexity. A geothermal system may require substantial excavation or drilling, site assessment and specialized installation.

For that reason, geothermal should not automatically be considered a replacement for an air-source heat pump in an existing home. The site itself is a major part of the system design.

Heat Pump Compressor Technology

Single-Stage Compressor

A single-stage compressor generally operates at one primary capacity. It is comparatively simple but can cycle on and off more frequently when the heating or cooling load is substantially below its rated capacity.

Two-Stage Compressor

A two-stage compressor can operate at a lower and higher capacity. The lower stage can provide longer cycles under moderate loads, potentially improving comfort and humidity control.

Variable-Speed Inverter Compressor

A variable-speed compressor can adjust its operating speed over a range.

Instead of:

100% → OFF → 100% → OFF

a variable-capacity system can operate more like:

35% → 42% → 55% → 48% → 38%

The actual modulation range varies by equipment.

Variable-speed technology can improve temperature stability, reduce cycling and allow the system to match changing heating and cooling loads more closely.

It does not, however, mean that every variable-speed system will consume less energy than every single-stage system. Installation quality, sizing, climate, equipment matching and operating conditions remain important.

Understanding SEER2, EER2, HSPF2 and COP

SEER2

SEER2 measures seasonal cooling efficiency. It is expressed in Btu of cooling delivered per watt-hour of electricity under the prescribed test procedure.

HSPF2

HSPF2 is a seasonal heating-efficiency metric. A higher HSPF2 generally indicates better seasonal heating efficiency under the rating procedure.

COP

COP is particularly useful when examining specific temperatures.

COP = useful heat delivered / electrical energy input

For example, a COP of 3 means that, under the specified test condition, the system delivers three units of heat for every one unit of electrical energy input, expressed using the same energy units.

However, COP is not a constant. It changes with outdoor temperature, indoor conditions, compressor speed, defrost operation and system configuration.

Heating Capacity Is More Important Than a Single Efficiency Number

Suppose two heat pumps both advertise a high HSPF2 rating. If one maintains substantially more heating capacity at your home’s design temperature, the systems may behave very differently during a cold spell.

For a cold-climate installation, examine:

• Heating capacity at 47°F.
• Heating capacity at 17°F.
• Heating capacity at 5°F.
• Heating capacity at 0°F if available.
• Heating capacity at the local design temperature.
• Electrical input at those temperatures.
• Defrost behavior.
• Backup heat requirements.

The heating load of the building should then be compared with the available heat-pump capacity.

How Heat Pump Sizing Works

Heat pump sizing should not be based simply on floor area.

A professional load calculation considers factors such as:

• Floor area
• Building orientation
• Insulation
• Window area
• Window performance
• Air infiltration
• Ceiling and roof construction
• Outdoor design temperature
• Indoor design temperature
• Occupancy
• Internal heat gains
• Existing ductwork

Manual J is the commonly referenced residential load-calculation methodology in the United States.

The key objective is to calculate the building’s heating and cooling loads rather than simply selecting equipment based on square footage.

Why Oversizing Can Be a Problem

An oversized heat pump may reach the thermostat setpoint quickly and cycle more often. This can reduce comfort and, depending on the system, reduce the benefits of longer low-capacity operation.

Why Undersizing Can Be a Problem

An undersized heat pump may struggle to maintain indoor temperature during design conditions and may require more supplemental heat.

For cold-climate applications, the more useful question is often:

“How much heat can this system actually deliver at my local design temperature?”

Heat Pump Refrigerants

The refrigerant is the working fluid that transports heat through the refrigeration cycle.

Historically, many residential systems used R-410A. Newer equipment increasingly uses lower-global-warming-potential refrigerants such as R-454B as the U.S. residential HVAC market transitions to newer equipment.

R-454B is an A2L refrigerant, meaning it has lower flammability characteristics than nonflammable refrigerants and therefore requires equipment and installation practices appropriate for an A2L refrigerant.

Do not assume that a new refrigerant can simply be substituted into an old heat pump. Refrigerant type is part of the equipment’s engineered design.

Why Refrigerant Matters to Buyers

• It affects equipment compatibility.
• It affects service procedures.
• It affects installation requirements.
• It affects future parts/service considerations.
• It is relevant to environmental performance.

Ductwork and Airflow

A highly efficient outdoor heat pump cannot compensate completely for a badly designed air-distribution system.

Duct problems include:

• Air leakage
• Insufficient return-air capacity
• Restricted supply ducts
• Improperly sized registers
• Poor insulation
• Unbalanced airflow
• Excessive static pressure

When replacing an old furnace or air conditioner with a heat pump, the installer should evaluate whether the existing duct system can provide the airflow required by the new equipment.

Backup and Supplemental Heat

Many all-electric ducted systems use electric resistance heat strips as supplemental heat.

Resistance heat is simple but has a COP close to 1 under normal operation because approximately one unit of electrical energy becomes one unit of heat.

A heat pump operating at a COP above 1 can deliver more heat per unit of electrical energy.

Cold-climate systems can reduce the amount of supplemental heating required, but whether backup heat is necessary depends on the design temperature, building load and selected system.

Heat Pump Installation Requirements

Heat pump performance depends heavily on installation.

Important Installation Checks

• Correct load calculation
• Correct equipment sizing
• AHRI-rated matched system where applicable
• Correct refrigerant piping
• Proper evacuation and charging
• Correct electrical supply
• Proper condensate drainage
• Outdoor-unit clearance
• Defrost drainage
• Airflow verification
• Duct leakage assessment
• Thermostat/control compatibility
• Backup heat configuration

In cold climates, outdoor-unit placement is especially important. Snow accumulation, ice formation and drainage can affect operation.

Choosing a Heat Pump by U.S. Climate

7 Heat Pump Models and Systems to Consider

The following seven selections are deliberately spread across different technologies rather than treating one manufacturer’s system as appropriate for every house.

Important: heat pump performance ratings are system- and match-dependent. The exact indoor unit, outdoor unit, coil, air handler, furnace and controls can change the certified rating. Always verify the exact combination rather than assuming that every size in a product family has the same efficiency.

1. Lennox SL22KLV — Best for Cold-Climate Whole-House Heating

What It Is and Its Primary Use Case

The Lennox SL22KLV is a variable-capacity cold-climate heat pump designed for ducted residential applications. It is particularly relevant to homeowners who want an all-electric system capable of substantial heating performance during very cold weather.

Lennox currently lists the SL22KLV in 2- to 5-ton nominal sizes, with up to 21.1 SEER2 and 10.5 HSPF2. Lennox specifies cold-climate operation down to -20°F and uses R-454B refrigerant. Source: Lennox 2026 product specifications.

Why We Selected It

• Variable-capacity compressor technology.
• Cold-climate design.
• Up to 21.1 SEER2.
• Up to 10.5 HSPF2.
• R-454B refrigerant.
• 2- to 5-ton range.
• Published operation down to -20°F.
• Electronic Refrigerant Injection technology for low-temperature operation.

Relevant Certification / Standards

Lennox lists the SL22KLV as ENERGY STAR certified and identifies it as an ENERGY STAR Most Efficient Cold Climate 2025 product. The system uses R-454B and is designed around current lower-GWP refrigerant requirements. Source: Lennox.

Important Limitations

• The system requires compatible indoor equipment and controls.
• The S40 communicating thermostat is required according to Lennox’s current product specification.
• Maximum published efficiency depends on the exact matched system.
• Higher-end equipment can involve higher acquisition and installation costs.
• Cold-climate operation does not mean identical heating capacity at every temperature.

Who Should Buy It

Consider it if you have a ducted home in a cold region and want a variable-capacity heat pump with substantial low-temperature capability.

Who Shouldn’t Buy It

It is not the logical choice for a homeowner who has no ductwork and wants a simple room-by-room ductless system, or for someone whose primary requirement is a low-cost basic heating system.

Technology: Variable-capacity ducted cold-climate air-source heat pump.

Source: Lennox current product documentation.

2. Bosch IDS Ultra — Best for Cold-Climate Ducted Retrofit

What It Is and Its Primary Use Case

The Bosch IDS Ultra is an inverter ducted split cold-climate heat pump designed for homeowners who want electric heating while retaining a conventional ducted distribution system.

Bosch specifies up to 19 SEER2 and 10 HSPF2, operation down to -13°F and 100% heating capacity at 5°F at a stated COP of 2.1. Bosch also says the system passed the U.S. Department of Energy Residential Cold Climate Heat Pump Challenge. Source: Bosch Home Comfort.

Why We Selected It

• EVI compressor technology.
• Inverter-driven rotary compressor.
• R-454B low-GWP refrigerant.
• 100% heating capacity at 5°F at the published test condition.
• Operation down to -13°F.
• Up to 19 SEER2.
• Up to 10 HSPF2.
• Outdoor motor with multiple speed control.
• Base-pan and crankcase heaters.

Relevant Certification / Standards

Bosch states that IDS Ultra passed the U.S. Department of Energy Residential Cold Climate Heat Pump Challenge and identifies R-454B as its A2L low-GWP refrigerant. Bosch also lists the system as capable of demand response through AHRI 1380. Source: Bosch Home Comfort.

Important Limitations

• Exact efficiency depends on the matched indoor unit.
• It is primarily a ducted solution.
• R-454B requires installation practices appropriate for A2L equipment.
• The advertised low-temperature capacity should not be confused with operation at every possible load condition.

Who Should Buy It

It is worth investigating for homeowners in cold climates who already have ductwork and want an inverter-driven heat pump specifically engineered around low-temperature performance.

Who Shouldn’t Buy It

It is not the natural choice for a single-room application where installing a ductless mini-split would be simpler.

Technology: Inverter ducted cold-climate air-source heat pump.

3. Trane 20 TruComfort Variable Speed Heat Pump — Best for Variable-Speed Whole-House Comfort

What It Is and Its Primary Use Case

Trane’s current 20 TruComfort Variable Speed Heat Pump with WeatherGuard, model 5TWV0, is the successor to the previous XV20i heat pump. It uses variable-speed operation and R-454B refrigerant.

Trane currently publishes up to 22.4 SEER2 and 10.5 HSPF2 for the 20 TruComfort variable-speed heat pump. Source: Trane.

Why We Selected It

• Variable-speed compressor.
• Up to 22.4 SEER2.
• Up to 10.5 HSPF2.
• R-454B refrigerant.
• Trane Link communicating technology.
• WeatherGuard protection on the specified product.
• Designed for continuous modulation rather than simple on/off operation.

Relevant Certification / Standards

Certification depends on the exact equipment combination. The homeowner should verify the final matched-system rating in the current AHRI directory and applicable ENERGY STAR listings.

Important Limitations

• Maximum published ratings apply only to qualifying combinations.
• Communicating controls and compatible indoor equipment can increase system complexity.
• Installation quality strongly affects real-world performance.
• The successor model should not be confused with older XV20i specifications.

Who Should Buy It

Consider it for a whole-house ducted installation where variable-speed comfort, high seasonal efficiency and an integrated communicating control system are priorities.

Who Shouldn’t Buy It

A homeowner seeking a basic, inexpensive single-stage system may not need the additional complexity of a premium variable-speed system.

Technology: Variable-speed ducted air-source heat pump.

4. Carrier Infinity 25VNA8 — Best for Variable-Speed Ducted Comfort

What It Is and Its Primary Use Case

The Carrier Infinity 25VNA8 is a variable-speed ducted heat pump designed for whole-home heating and cooling. Carrier lists up to 19 SEER2 and describes five compressor capacity stages, with operation capable of stepping down to approximately 25% capacity.

The lower-capacity operation is intended to allow longer, quieter cycles and more stable indoor conditions. Source: Carrier.

Why We Selected It

• Variable-speed compression.
• Five capacity stages.
• Can operate at approximately 25% of maximum capacity.
• Up to 19 SEER2.
• Designed for integration with the Infinity control ecosystem.
• Suitable for ducted whole-house applications.

Relevant Certification / Standards

Carrier lists the 25VNA8 as an Infinity variable-speed heat pump. Exact ENERGY STAR status and efficiency depend on the particular AHRI-rated combination and size.

Important Limitations

• It is primarily intended for ducted systems.
• The 19 SEER2 figure is a maximum and does not apply to every size or match.
• Older documentation may use legacy SEER/HSPF ratings, so current AHRI data should be checked.
• Premium controls and compatible equipment may add cost.

Who Should Buy It

It is a strong system to investigate when replacing a central air conditioner or furnace/air-conditioner combination in a home with suitable ductwork.

Who Shouldn’t Buy It

It is not appropriate when the homeowner specifically wants a wall-mounted ductless mini-split system.

Technology: Variable-speed ducted air-source heat pump.

5. Daikin FIT DZ6VSA — Best for Compact Ducted Installations

What It Is and Its Primary Use Case

The Daikin FIT DZ6VSA is an inverter-driven ducted heat pump intended for whole-home systems where a compact outdoor unit and variable-capacity operation are useful.

Daikin lists up to 17.5 SEER2, 10.9 EER2 and 8.5 HSPF2, with capacities from 1.5 to 5 tons. The product is AHRI certified and ETL listed according to Daikin’s product page. Source: Daikin Comfort.

Why We Selected It

• Inverter technology.
• 1.5- to 5-ton capacity range.
• Up to 17.5 SEER2.
• Up to 10.9 EER2.
• Up to 8.5 HSPF2.
• Compact ducted configuration.
• Enhanced-capacity models are available within the product family.

Relevant Certification / Standards

Daikin states that the FIT is AHRI Certified and ETL Listed. Exact certification and efficiency should be verified for the selected combination.

Important Limitations

• It is not primarily a ductless room-by-room solution.
• Maximum ratings depend on equipment matching.
• The published product page identifies R-410A, so homeowners should confirm current model/refrigerant availability when purchasing new equipment.
• Low-temperature capacity must be checked separately from seasonal ratings.

Who Should Buy It

Consider it for a ducted home where outdoor-unit footprint, inverter operation and whole-house heating and cooling are important.

Who Shouldn’t Buy It

It is not the first system to investigate for someone specifically seeking the latest R-454B cold-climate platform or a ductless installation.

Technology: Inverter ducted air-source heat pump.

6. Mitsubishi SUZ-NLHZ — Best for Flexible Cold-Climate Ducted or Ductless Applications

What It Is and Its Primary Use Case

The Mitsubishi SUZ-NLHZ is a single-zone Universal Hyper-Heating outdoor unit. It can be paired with multiple ducted and ductless indoor-unit configurations.

Mitsubishi states that its Hyper-Heating INVERTER technology can provide heating at outdoor temperatures as low as -13°F and up to 100% heating capacity at 5°F. The manufacturer also states that the SUZ-NLHZ can work with seven different ducted and ductless indoor-unit options in a single-zone configuration. Source: Mitsubishi Electric HVAC US.

Why We Selected It

• Hyper-Heating INVERTER technology.
• Single-zone configuration.
• Ducted and ductless indoor-unit compatibility.
• Heating operation down to -13°F.
• Up to 100% heating capacity at 5°F according to Mitsubishi’s published description.
• Useful for retrofit applications where conventional ductwork may not be the best option.

Relevant Certification / Standards

Mitsubishi identifies the system as ENERGY STAR capable/qualified within applicable configurations. The exact rating must be verified for the chosen indoor/outdoor combination.

Important Limitations

• It is a single-zone outdoor unit.
• Actual performance depends on the paired indoor unit.
• Ducted and ductless configurations have different installation requirements.
• A system operating at -13°F is not necessarily delivering its maximum rated capacity at that temperature.

Who Should Buy It

It is particularly interesting for homeowners who need cold-weather performance but want flexibility between a concealed ducted indoor unit and a conventional ductless indoor unit.

Who Shouldn’t Buy It

It is not the correct architecture for a homeowner who needs several independent zones from one outdoor unit; a multi-zone system should be investigated instead.

Technology: Single-zone Hyper-Heating inverter air-source heat pump.

7. Fujitsu AIRSTAGE 15LZBH1 — Best for a Single Cold-Climate Zone

What It Is and Its Primary Use Case

The Fujitsu AIRSTAGE 15LZBH1 is a wall-mounted single-room mini-split system designed for heating and cooling a defined zone.

Fujitsu lists a nominal 12,000 Btu/h cooling capacity with a heating range reaching 22,000 Btu/h, inverter technology, extra-low-temperature heating and operation down to -5°F on the current product page. The published page lists R-410A refrigerant and older HSPF/SEER values, so current certification and refrigerant status should be checked before purchase. Source: Fujitsu General.

Why We Selected It

• Single-zone ductless design.
• Inverter compressor.
• Extra-low-temperature heating.
• Published heating operation to -5°F.
• Heating capacity range up to 22,000 Btu/h.
• Washable filter.
• Programmable remote.

Relevant Certification / Standards

Fujitsu identifies the product as ENERGY STAR qualified on its product documentation. Because the page uses legacy HSPF/SEER terminology and R-410A, buyers should verify the current certification record and exact equipment availability before purchasing.

Important Limitations

• It is a single-zone system.
• A wall-mounted indoor unit is visible in the room.
• It is not designed to distribute heat through an existing whole-house duct system.
• Published ratings should not be directly compared with newer SEER2/HSPF2 ratings without accounting for the rating standard.

Who Should Buy It

It is useful to investigate for a room, addition, workshop, bedroom or other zone where ductless heating and cooling is preferred.

Who Shouldn’t Buy It

It is not a substitute for a properly sized whole-house system where several rooms need centralized conditioning.

Technology: Single-zone ductless inverter air-source heat pump.

Seven-Model Comparison Table

How to interpret this table: these are not directly interchangeable systems. The Mitsubishi and Fujitsu products are fundamentally different architectures from the ducted Lennox, Bosch, Trane, Carrier and Daikin systems. A homeowner should first determine the required technology and capacity, then compare products within that category.

How Much Electricity Does a Heat Pump Use?

A simple instantaneous calculation can be expressed as:

Electrical input ≈ Heating output / COP

For example, if a heat pump delivers 36,000 Btu/h at a particular operating point and has a COP of 3:

36,000 Btu/h ÷ 3 = 12,000 Btu/h of electrical energy equivalent

Since one kilowatt-hour is approximately 3,412 Btu, the corresponding electrical input is approximately:

12,000 ÷ 3,412 ≈ 3.52 kWh per hour

This is an illustrative calculation, not a prediction of actual household electricity use.

Actual seasonal consumption depends on:

• Outdoor temperature
• Indoor temperature
• Building heat loss
• Heat-pump capacity
• Compressor modulation
• Defrost cycles
• Backup heat use
• Thermostat settings
• Electricity price
• Duct losses
• Maintenance

Heat Pump Maintenance

Homeowner Maintenance

• Keep filters clean.
• Keep outdoor coils free from leaves and debris.
• Keep snow and ice from blocking the outdoor unit.
• Keep airflow paths clear.
• Inspect indoor units for dust buildup.
• Watch for unusual noise or vibration.
• Check condensate drainage.

Professional Maintenance

A qualified HVAC professional should periodically check airflow, electrical connections, refrigerant-system condition, coils, condensate drainage and system controls.

ENERGY STAR also recommends keeping heat-pump filters clean and maintaining unobstructed airflow. Source: ENERGY STAR.

Common Heat Pump Buying Mistakes

1. Choosing Only by SEER2

SEER2 is a cooling-season metric. A homeowner in a cold region should also examine heating efficiency and low-temperature heating capacity.

2. Choosing Only by HSPF2

HSPF2 is seasonal. It does not tell you everything about the system’s capacity at a particular outdoor temperature.

3. Ignoring the Matched System

A heat-pump outdoor unit does not have one universal efficiency rating independent of its indoor equipment. The certified rating applies to a specific combination.

4. Buying Too Large a Unit

Oversizing can create cycling and comfort problems.

5. Ignoring Ductwork

A high-efficiency heat pump installed on inadequate ductwork may fail to deliver the expected comfort and efficiency.

6. Confusing Minimum Operating Temperature With Full Capacity

A manufacturer may specify operation at -13°F or -20°F. That does not automatically mean that the unit delivers its full rated capacity at that temperature.

7. Ignoring Electricity Prices

The most efficient heat pump is not automatically the lowest-cost heating option for every household. Electricity prices, gas prices, climate and building load all matter.

8. Treating Installation as an Afterthought

Heat-pump performance depends heavily on correct sizing, matching, airflow, refrigerant charge, controls and commissioning.

Frequently Asked Questions About Heat Pumps

Are heat pumps good for cold climates?

Yes. Modern cold-climate heat pumps are specifically engineered and tested to provide useful heating performance at low outdoor temperatures. ENERGY STAR’s current Cold Climate designation requires performance testing at 5°F, including a COP threshold and heating-capacity retention requirement.

Can a heat pump replace a gas furnace?

In many homes, yes. Whether it should replace the furnace entirely depends on climate, heating load, electrical service, backup requirements and local energy costs. A dual-fuel configuration is another option.

Do heat pumps work below 0°F?

Some models are specifically designed to operate below 0°F. For example, manufacturers currently publish systems with operating ranges extending to -13°F or -20°F. However, operating temperature and heating capacity are different specifications.

What is a cold-climate heat pump?

It is a heat pump that meets defined efficiency and low-temperature performance requirements. Under the current ENERGY STAR specification, qualifying residential cold-climate systems must demonstrate specific performance at 5°F.

What is HSPF2?

HSPF2 stands for Heating Seasonal Performance Factor 2. It measures seasonal heating efficiency under the applicable standardized test procedure.

What is SEER2?

SEER2 stands for Seasonal Energy Efficiency Ratio 2 and measures seasonal cooling efficiency.

What is COP?

COP is the ratio of useful heating or cooling output to energy input under a specified operating condition. Unlike a seasonal rating, COP can describe performance at a particular outdoor temperature.

Is a higher SEER2 always better?

Not necessarily for every homeowner. Higher rated efficiency may come with higher equipment costs, and the financial value depends on climate, operating hours, electricity prices and the system’s installed cost.

Is variable speed better than single stage?

Variable-speed systems provide more capacity modulation and can improve temperature stability and part-load operation. However, whether the additional cost is worthwhile depends on the application and installation.

Can I install a heat pump with my existing furnace?

Yes, when compatible equipment and controls are used. This configuration is commonly called a dual-fuel or hybrid heating system.

Can a heat pump use existing ductwork?

Yes. Ducted heat pumps are specifically designed for forced-air distribution. The existing ductwork should nevertheless be evaluated for leakage, airflow, sizing and static pressure.

Can I install a heat pump without ducts?

Yes. Ductless mini-split heat pumps use refrigerant piping between the outdoor unit and indoor air-handling units.

How many tons of heat pump do I need?

The correct size should be determined from a building load calculation rather than simply multiplying house square footage by a fixed number.

What happens when a heat pump goes into defrost mode?

When frost accumulates on the outdoor heat exchanger during heating operation, the system may temporarily reverse its refrigeration cycle to remove the frost. The control system manages this process and may use supplemental heat to maintain indoor comfort.

Does a heat pump provide heat and air conditioning?

Most residential air-source heat pumps are reversible systems capable of both heating and cooling.

Do heat pumps need maintenance?

Yes. Filters, coils, airflow, electrical components, condensate drainage and the refrigeration system should be maintained as appropriate for the equipment.

Are ductless heat pumps more efficient than ducted heat pumps?

Not universally. Ductless systems can avoid duct losses, but actual efficiency depends on the equipment, configuration, climate, installation and operating conditions.

How long does a heat pump last?

Service life varies substantially with equipment quality, climate, installation, operating hours and maintenance. Rather than relying on a single advertised lifespan, examine the manufacturer’s warranty, service availability and expected maintenance requirements.

Should I buy an R-410A or R-454B heat pump?

For a new installation, the exact equipment available in your market and current regulatory requirements should be considered. R-454B is among the lower-GWP refrigerants being used in newer residential HVAC equipment. Compatibility is system-specific, so refrigerants should never be mixed or substituted without following the manufacturer’s engineering and installation requirements.

What is the most important specification for a cold-climate heat pump?

There is no single number. Look at heating capacity at the local design temperature, low-temperature COP, HSPF2, cold-climate certification, supplemental-heat strategy and the ability of the system to match the building load.

Can solar panels power a heat pump?

Yes. Solar photovoltaic electricity can offset electricity consumed by a heat pump, although the relationship between solar production and heating demand depends on time of day, season, battery storage and grid connection.

Are heat pumps cheaper to run than furnaces?

It depends on the heat pump’s efficiency, outdoor temperature, fuel type, electricity price, furnace efficiency and building heat load. A comparison should use actual local energy prices rather than assuming that one technology is universally cheaper.

Final Heat Pump Buying Checklist

Sources and Technical Verification

Product specifications and regulatory requirements change. For a purchase decision, verify the exact model combination using the manufacturer’s current technical documentation and the current AHRI/ENERGY STAR records rather than relying solely on a retailer’s product description.

• ENERGY STAR — Residential Air-Source Heat Pump Criteria
• Lennox — SL22KLV Product Specifications
• Bosch Home Comfort — IDS Ultra Product Specifications
• Trane — 20 TruComfort Variable Speed Heat Pump
• Carrier — Infinity 25VNA8 Heat Pump
• Daikin Comfort — FIT DZ6VSA Heat Pump
• Mitsubishi Electric HVAC US — SUZ-NLHZ Hyper-Heating Heat Pump
• Fujitsu General — AIRSTAGE 15LZBH1

Editorial note: “Best” in this article means best suited to the stated use case, technology or technical requirement—not a universal ranking of every heat pump sold in the United States. Product availability, certification, refrigerant, efficiency and model numbers should be rechecked before publication or purchase because manufacturers periodically replace product generations.

Explore Our Heat Pump Buying Guides

Different homes and climates require different heat-pump technologies. Use these guides to narrow your choice based on your home’s construction, climate and heating requirements.

• Best Ducted Heat Pumps in the USA
• Best Ductless Mini-Split Heat Pumps in the USA
• Best Cold-Climate Heat Pumps in the USA
• Best Heat Pumps by Climate in the USA
• Best Dual-Fuel Heat Pumps in the USA
• Best Geothermal Heat Pumps in the USA
• Best Heat Pumps for Different Homes in the USA
• Heat Pump Buying Guide for the USA