Heat Pump Buying Guide For The USA: How To Choose The Right Heat Pump For Your Home

You cannot simply compare two model numbers, choose the one with the largest efficiency number and assume the job is finished.

A heat pump is part of a complete heating and cooling system. Its performance depends on the house, climate, insulation, windows, ductwork, thermostat, electrical system, outdoor temperature and—most importantly—the way the equipment was sized and installed.

That is why a moderately priced heat pump installed correctly can sometimes make more sense than an extremely efficient heat pump installed on poorly designed ducts or badly matched equipment.

This guide explains the major decisions a homeowner in the United States should make before buying a heat pump.

Quick Answer: What Should You Buy?

Start with the house rather than the brand.

The Most Important Rule: Size The Heat Pump Correctly

If you remember only one thing from this guide, remember this:

Do not size a heat pump from square footage alone.

A 2,000-square-foot house in Maine and a 2,000-square-foot house in Florida can have completely different heating requirements.

Even two houses in the same neighborhood can have substantially different loads.

The calculation should account for factors such as:

• Local climate
• Outdoor design temperature
• Indoor design temperature
• Insulation
• Air leakage
• Window area
• Window orientation
• Window performance
• Ceiling height
• Basement or crawl-space conditions
• Solar gains
• Occupancy
• Internal heat gains
• Ventilation
• Room-by-room characteristics

A professional load calculation, commonly associated with Manual J methodology for residential buildings, provides a much better basis for equipment selection than rules such as “one ton for every 500 square feet.”

Why Oversizing A Heat Pump Can Be A Problem

Homeowners sometimes assume that bigger is safer.

With HVAC equipment, that is not necessarily true.

Imagine a house that requires only 18,000 Btu/h of cooling on a particular mild summer day.

If the installed heat pump has far more capacity than the house requires and cannot modulate sufficiently downward, it can satisfy the thermostat quickly and shut off.

Then the temperature rises again.

The compressor starts.

It satisfies the thermostat.

It stops.

This repeated cycling can reduce comfort and may interfere with effective humidity control.

Variable-capacity systems can reduce this problem by adjusting output, but correct sizing remains important even with inverter-driven equipment.

Why Undersizing Can Also Be A Problem

The opposite problem occurs when the heat pump does not have sufficient heating capacity for the home’s winter load.

This becomes especially important in cold climates.

A system may have an attractive heating rating at 47°F but substantially less capacity at 5°F.

If the house requires 40,000 Btu/h at the local design temperature but the heat pump can deliver only 25,000 Btu/h at that condition, another heat source may have to provide the difference.

That is not necessarily a problem.

Many heat-pump systems are intentionally designed with auxiliary or backup heat.

The problem occurs when the homeowner does not understand how frequently that backup system will operate.

Heating Capacity Matters More Than The Model’s Maximum Capacity

When evaluating a heat pump, ask the contractor for the heating capacity at several outdoor temperatures.

ENERGY STAR’s current Version 6.2 cold-climate requirements require qualifying split heat pumps to demonstrate a COP of at least 1.75 at 5°F and retain at least 70% of the applicable 47°F heating capacity at 5°F. The program also requires a controls-verification procedure for the low-temperature performance.

Standard Heat Pump Or Cold-Climate Heat Pump?

This is one of the first major decisions for homeowners in the United States.

Standard Heat Pump

A conventional heat pump may be perfectly suitable for a mild or moderate climate where extremely low temperatures are uncommon.

Cold-Climate Heat Pump

A cold-climate heat pump is specifically evaluated for low-temperature heating performance.

The current ENERGY STAR specification establishes separate efficiency and low-temperature requirements for the cold-climate designation. For split systems, the minimum cold-climate requirements include 15.2 SEER2 and 8.1 HSPF2 for ducted systems, along with the low-temperature requirements described above.

That distinction is useful because a homeowner in Minnesota should not select equipment using only the same criteria that might be sufficient in Georgia.

What Is SEER2?

SEER2 means Seasonal Energy Efficiency Ratio 2.

It represents cooling efficiency over a defined seasonal test methodology.

In simplified terms:

SEER2 = seasonal cooling output ÷ electrical energy consumed

A higher SEER2 generally indicates greater seasonal cooling efficiency under the standardized test methodology.

But SEER2 is not the same thing as your home’s actual seasonal efficiency.

Real-world performance depends on outdoor temperatures, indoor temperatures, cycling, airflow, duct losses and installation quality.

ENERGY STAR defines SEER2 using the updated Appendix M1 test procedure.

What Is EER2?

EER2 is the Energy Efficiency Ratio under the updated test procedure.

Unlike a seasonal rating, EER2 represents performance under a specified operating condition.

This can make EER2 useful when considering performance during high-load cooling conditions.

For example, a homeowner in a very hot climate may want to pay attention to EER2 rather than looking exclusively at SEER2.

What Is HSPF2?

HSPF2 is the Heating Seasonal Performance Factor 2.

It represents seasonal heating efficiency under a standardized heating-season methodology.

A higher HSPF2 generally indicates better seasonal heating efficiency under the test assumptions.

However, HSPF2 should not be used by itself when evaluating a cold-climate installation.

For a cold-climate home, actual capacity and COP at low outdoor temperatures are particularly important.

ENERGY STAR’s current definitions distinguish HSPF2 from the older HSPF rating system.

What Is COP?

COP means Coefficient of Performance.

It is a ratio of useful heating delivered to electrical energy consumed under a specified operating condition.

For example, a COP of 3 means that, under the specified test conditions, the system delivers three units of heating output for each unit of electrical energy input.

ENERGY STAR defines COP as the ratio of the average rate of space heating delivered to the average rate of electrical energy consumed at the specified test conditions.

Unlike HSPF2, COP is not inherently a seasonal number.

This is why COP at 5°F can be extremely useful when comparing cold-climate systems.

One Comparison Table For Heat-Pump Efficiency Ratings

Do Not Compare Ratings Without Checking The Test Conditions

This is a common mistake in online heat-pump comparisons.

Suppose System A has a COP of 4.0 and System B has a COP of 3.6.

It would be tempting to say that System A is more efficient.

But what if System A’s rating was obtained under a much warmer entering-air or entering-water condition?

The comparison may no longer mean what the homeowner thinks it means.

The same principle applies to geothermal heat pumps, where entering-water temperatures have a major effect on COP and EER.

ENERGY STAR: What Does It Actually Mean?

ENERGY STAR certification is useful because it establishes standardized eligibility criteria and uses third-party certification procedures.

The current ENERGY STAR Version 6.2 specification for residential split heat pumps requires at least 15.2 SEER2, 11.0 EER2 and 7.8 HSPF2 for standard qualifying split systems.

Cold-climate products have additional requirements.

However, ENERGY STAR certification does not mean that every ENERGY STAR system will be equally appropriate for every house.

A certified 3-ton system can still be the wrong choice for a house that requires 2 tons.

Always Check The Exact Matched System

A heat-pump system normally contains more than one major component.

A ducted split system may include:

• Outdoor heat-pump unit
• Indoor coil
• Air handler or furnace
• Expansion device
• Thermostat
• Auxiliary heat kit

The efficiency rating can depend on the combination of those components.

ENERGY STAR’s current certification data specifically distinguishes the outdoor model and indoor-unit model for split systems.

Therefore, the model number printed on an outdoor unit is not always enough to determine the actual certified system performance.

What Is AHRI Certification?

The Air-Conditioning, Heating, and Refrigeration Institute maintains certification programs and directories used to verify equipment combinations and performance information.

When comparing quotes, ask the contractor for the exact AHRI certificate or certification information corresponding to the proposed equipment combination.

This can help verify:

• Outdoor unit
• Indoor unit
• Capacity
• Efficiency
• Matched-system configuration

Ducted Or Ductless?

This is one of the biggest architectural decisions in a heat-pump installation.

Ducted Heat Pump

A ducted system distributes conditioned air through supply and return ducts.

It can be particularly convenient when the house already has a properly designed central duct system.

Ductless Mini-Split

A ductless system uses indoor units connected to the outdoor heat pump by refrigerant lines.

This can be useful when:

• The house has no ducts.
• The existing ducts are severely inadequate.
• An addition needs separate conditioning.
• Individual rooms have different loads.
• A homeowner wants room-level control.

Mixed Systems

Some homes can use a combination of ducted and ductless equipment.

For example, the main portion of a house could use central ductwork while a converted garage or new addition receives a dedicated mini-split.

Should You Reuse Existing Ducts?

Often yes—but only after inspection.

Existing ducts should be evaluated for:

• Size
• Leakage
• Insulation
• Static pressure
• Supply-air distribution
• Return-air capacity
• Location

Ducts in unconditioned attics can be especially problematic because leakage and conductive losses occur outside the conditioned envelope.

DOE research has demonstrated that duct characteristics can materially influence the performance of heat-pump systems.

Heat Pump With A Furnace Or All-Electric?

Homeowners with an existing gas furnace generally have two broad paths.

Option 1: Replace The Furnace With An All-Electric Heat Pump

The heat pump provides the primary heating system, with electric resistance heat potentially serving as auxiliary heat.

Option 2: Use Dual Fuel

The heat pump provides heating during appropriate conditions while the existing or replacement gas furnace provides heat under selected conditions.

ENERGY STAR recognizes dual-fuel systems as a configuration that combines a heat pump with a conventional gas or oil furnace.

The choice should consider:

• Local winter temperatures
• Electricity rates
• Natural-gas rates
• Existing furnace condition
• Electrical-service capacity
• Desired electrification level
• Backup heating requirements

Auxiliary Heat Versus Emergency Heat

These terms are often confused.

Auxiliary heat generally refers to supplemental heat that helps the heat pump when additional capacity is required.

Emergency heat is a user-selected operating mode on systems equipped with an appropriate backup heat source.

The exact behavior depends on the thermostat and equipment.

Homeowners should ask the installer to explain exactly when auxiliary heat will activate.

Electric Resistance Backup Heat

Electric resistance heaters are simple and can provide substantial backup capacity.

But resistance heating has a COP of approximately 1 at the point of use.

That means one unit of electrical energy produces approximately one unit of heat.

A heat pump can deliver substantially more heating output per unit of electricity under favorable conditions because it moves heat rather than generating all of it directly.

Therefore, excessive resistance-heat operation can significantly change the economics of an all-electric heat-pump installation.

Cold Climate Buying Strategy

If your winter temperatures regularly fall below freezing, do not stop at the HSPF2 rating.

Ask for:

• Heating capacity at 47°F
• Heating capacity at 17°F
• Heating capacity at 5°F
• COP at 5°F
• Minimum operating temperature
• Defrost behavior
• Auxiliary heat requirement

ENERGY STAR’s current cold-climate designation gives consumers a standardized low-temperature benchmark by requiring qualifying equipment to demonstrate performance at 5°F.

Hot Climate Buying Strategy

In hot regions, heating may not be the dominant consideration.

Pay particular attention to:

• SEER2
• EER2
• High-ambient cooling capability
• Humidity control
• Part-load efficiency
• Noise

A homeowner in Arizona may care much more about summer cooling performance than a homeowner in Minnesota.

Conversely, a homeowner in Minnesota should not select a system solely because it has an excellent cooling rating.

Humid Climate Buying Strategy

Temperature and humidity are related but different problems.

A house can reach 74°F while still feeling uncomfortable if indoor relative humidity remains high.

Heat-pump selection therefore needs to consider:

• Cooling capacity
• Indoor airflow
• Coil temperature
• Runtime
• Building infiltration
• Dehumidification controls

Oversized equipment can satisfy the temperature thermostat rapidly and may reduce the opportunity for prolonged moisture removal.

Variable-Speed Or Single-Stage?

Variable-speed equipment is attractive because it can adjust output to changing loads.

But that additional flexibility comes with greater control and commissioning requirements.

Why Variable-Speed Systems Need Good Installation

A sophisticated compressor cannot compensate for:

• Incorrect refrigerant charge
• Bad airflow
• Incorrect static pressure
• Poor duct design
• Incorrect thermostat setup
• Improper indoor/outdoor matching

In fact, the more sophisticated the system, the more important correct commissioning can become.

Heat Pump Refrigerants

The residential HVAC market is transitioning to lower-GWP refrigerants.

Current equipment can use refrigerants such as R-32 and R-454B depending on manufacturer and model.

When purchasing a new system, record the exact refrigerant used by the proposed model.

This matters for:

• Installation procedures
• Service equipment
• Technician qualifications
• Future servicing
• Replacement planning

Do not assume that a product family uses the same refrigerant across every generation.

R-32 Versus R-454B

Both are part of the industry’s move toward lower-GWP refrigerant solutions.

R-454B is an A2L refrigerant blend, while R-32 is also classified as A2L.

A2L indicates lower flammability than traditional A3 refrigerants, but it still requires appropriate installation practices and equipment designed for the refrigerant.

For homeowners, the important point is simple:

Do not let an installer substitute refrigerants or equipment components outside the manufacturer’s approved configuration.

Electrical Requirements

Converting a gas-heated home to an all-electric heat pump can increase electrical demand.

The contractor should evaluate:

• Main service rating
• Panel capacity
• Heat-pump breaker
• Auxiliary heat kit
• Wire size
• Disconnect
• Existing electrical loads

Electric resistance backup heat deserves particular attention because a large auxiliary heat kit can create a substantial electrical load.

Do You Need A Panel Upgrade?

Not necessarily.

The answer depends on the home’s existing electrical load and the proposed equipment.

A load calculation should be performed before assuming that a panel upgrade is necessary.

Conversely, homeowners should not assume that the existing panel will automatically be sufficient.

Heat Pump Noise

Noise becomes increasingly important when an outdoor unit is close to a bedroom window, property boundary or patio.

Ask for the manufacturer’s published sound rating and consider:

• Outdoor-unit location
• Wall reflections
• Vibration isolation
• Operating speed
• Nighttime operation

Variable-speed compressors can often operate at lower speeds for extended periods, but actual perceived noise still depends on the equipment and installation.

Thermostat Selection

The thermostat is not merely a temperature display.

For modern variable-capacity systems, the thermostat and control architecture can determine:

• Compressor staging
• Capacity modulation
• Auxiliary heat operation
• Humidity control
• Zoning
• Defrost behavior
• Remote monitoring

ENERGY STAR’s smart-thermostat criteria include requirements concerning scheduling, energy feedback and HVAC-use information, but compatibility with the particular heat pump remains essential.

Do You Need A Smart Thermostat?

No.

A conventional thermostat can operate many heat pumps.

But some advanced variable-capacity systems are designed around communicating controls that allow the thermostat and equipment to exchange more detailed information.

Before replacing a manufacturer’s communicating thermostat with a generic smart thermostat, verify compatibility.

Heat Pump Zoning

Zoning can be useful in larger or irregular homes.

For example:

• First floor
• Second floor
• Master bedroom area
• Finished basement

However, zoning changes duct airflow.

If several dampers close while the blower continues moving air, static pressure can rise.

A properly designed zoned system therefore requires:

• Correct duct sizing
• Appropriate dampers
• Static-pressure management
• Return-air planning
• Compatible controls

Mini-Split Buying Guide

For ductless systems, the indoor unit is just as important as the outdoor compressor.

Evaluate:

• Indoor-unit capacity
• Outdoor-unit capacity
• Number of zones
• Minimum modulation
• Heating capacity at low temperature
• Indoor sound level
• Condensate drainage
• Indoor-unit location

Do not simply add together the maximum capacity of every indoor head and assume the outdoor unit needs the same total capacity.

Multi-zone systems are designed around the relationship between simultaneous loads and the outdoor unit’s operating range.

Single-Zone Versus Multi-Zone Mini-Split

Geothermal Or Air-Source?

For homeowners considering geothermal, the decision is fundamentally different.

Geothermal systems exchange heat with the ground rather than outdoor air.

They can offer high efficiency and relatively stable source temperatures, but require a ground-loop or water-source system.

Air-source systems are generally simpler to install because they do not require drilling or extensive ground-loop construction.

Geothermal therefore needs to be evaluated using total installed system cost, not simply the heat-pump equipment price.

For the detailed geothermal comparison, see:

Best Geothermal Heat Pumps In The USA

Air-Source Versus Geothermal

What About Water-Source Heat Pumps?

Water-source systems can use groundwater, surface water or closed-loop water circuits.

They can be technically effective, but site conditions and regulations matter.

For open-loop geothermal, water quantity and water chemistry should be evaluated before installation.

Heat Pump Installation Cost

Do not judge a heat-pump quotation solely by the outdoor-unit price.

The complete project may include:

• Outdoor heat pump
• Indoor coil
• Air handler or furnace
• Thermostat
• Auxiliary heat
• Electrical work
• Refrigerant piping
• Drainage
• Duct modifications
• Controls
• Permits
• Commissioning

For ductless installations, line-set length and the number of indoor units can significantly affect installation requirements.

For geothermal, the loop field can represent a major part of the project.

Do Not Compare Quotes Until The Scope Is Equal

Suppose Contractor A quotes $12,000 and Contractor B quotes $16,000.

The cheaper quote is not necessarily cheaper if it excludes:

• Electrical upgrades
• New thermostat
• Duct modifications
• Auxiliary heat
• Permit fees
• Startup commissioning

Always compare the complete scope of work.

What A Good Heat-Pump Quote Should Contain

How To Choose A Contractor

The installer deserves almost as much attention as the equipment manufacturer.

Ask whether the contractor:

• Performs load calculations.
• Can provide the exact matched-system certification.
• Has experience with heat pumps in your climate.
• Can explain low-temperature performance.
• Tests duct static pressure.
• Measures airflow.
• Checks refrigerant charge using the manufacturer’s procedure.
• Explains auxiliary heat operation.
• Provides written commissioning information.
• Can service the specific equipment after installation.

Questions A Good Contractor Should Be Comfortable Answering

You should be able to ask:

1. What is my heating load?
2. What is my cooling load?
3. What outdoor design temperature did you use?
4. What is the heat pump’s capacity at that temperature?
5. What is the capacity at 5°F?
6. Will auxiliary heat be required?
7. How often do you expect it to operate?
8. Can my existing ducts handle the system?
9. What is the duct static pressure?
10. What is the exact indoor/outdoor matched system?
11. What is the AHRI certification information?
12. Is this ENERGY STAR certified?
13. Does it carry the ENERGY STAR Cold Climate designation?
14. What refrigerant does it use?
15. What electrical changes are required?
16. How will the system be commissioned?

Maintenance After Installation

A heat pump is not maintenance-free.

Filters

Dirty filters reduce airflow and can affect performance.

Outdoor Coil

The outdoor coil should remain reasonably clean and unobstructed.

Indoor Coil

The indoor coil should be kept clean and inspected as part of appropriate HVAC maintenance.

Condensate

Cooling operation produces condensate. Drainage must remain clear.

Electrical Connections

Electrical components should be inspected by a qualified technician during service.

Refrigerant Circuit

Homeowners should not attempt refrigerant service themselves. A qualified technician should investigate suspected leaks or abnormal operating conditions.

How Often Should A Heat Pump Be Serviced?

There is no single service interval that applies to every system.

However, annual professional inspection is a reasonable planning approach, particularly before the heating season in climates where winter heating is important.

Filter maintenance may be required considerably more frequently depending on the filter, house and occupancy.

ENERGY STAR also recommends keeping heat-pump filters clean and using appropriate fan settings.

Heat Pump Life Expectancy

Actual service life depends on equipment quality, installation, operating conditions, maintenance and climate.

Compressors and outdoor coils are exposed to weather and repeated operating cycles.

A poorly installed system can experience problems much earlier than a properly commissioned system.

Therefore, the warranty should be examined alongside the equipment’s purchase price.

What To Look For In A Heat-Pump Warranty

Separate the warranty into:

• Compressor warranty
• Parts warranty
• Labor warranty
• Heat-exchanger warranty where applicable
• Registration requirements
• Transferability
• Warranty exclusions

A 10-year parts warranty does not necessarily mean the homeowner has 10 years of free labor.

Federal Incentives And Rebates

Energy-efficiency incentives can change because they depend on federal law, state programs and utility policies.

Do not assume that a tax-credit article from several years ago still applies to a 2026 purchase.

For current purchases, verify eligibility directly with the relevant federal agency, state program and utility before including an incentive in your financial calculation.

ENERGY STAR currently publishes federal incentive information for qualifying air-source heat pumps and directs consumers to its current tax-credit resources.

Calculate Operating Cost Instead Of Guessing

A useful comparison requires more than looking at the heat pump’s efficiency rating.

For a simplified heating comparison:

Heating Cost ≈ Required Heat ÷ System Efficiency × Electricity Price

The actual calculation is more complicated because heat-pump efficiency changes with outdoor temperature and operating conditions.

For a cold-climate system, the homeowner should ideally evaluate a range of outdoor temperatures rather than assume one COP applies throughout the winter.

Heat Pump Versus Gas Furnace

The operating-cost comparison depends on both energy prices and equipment efficiency.

A modern heat pump does not generate heat in the same way as a gas furnace. It transfers heat from one location to another.

At favorable conditions, that can allow more heat to be delivered per unit of electrical energy than direct electric resistance heating.

However, the economic comparison with natural gas depends on:

• Electricity price
• Gas price
• Heat-pump COP
• Furnace efficiency
• Outdoor temperature
• Backup-heat operation
• Distribution losses

Heat Pump Versus Electric Resistance

This comparison is more straightforward.

Electric resistance heating has a point-of-use COP of approximately 1.

A heat pump moves heat and can have a COP above 1 under suitable conditions.

Therefore, replacing resistance heating with a properly designed heat pump can potentially reduce electricity consumption for the same heating service.

The exact savings depend on the operating conditions and equipment.

Do Heat Pumps Work At Night?

Yes.

A heat pump is designed to operate whenever the building requires heating or cooling.

ENERGY STAR recommends maintaining a reasonably steady temperature rather than treating a heat pump exactly like a conventional furnace that is aggressively turned down whenever occupants leave.

The appropriate thermostat strategy still depends on the equipment, climate and homeowner preferences.

Should You Turn A Heat Pump Off When Leaving Home?

There is no universal rule that applies to every house and every control system.

Large temperature setbacks can sometimes trigger auxiliary heat when the system attempts to recover quickly.

Modern variable-capacity systems may behave differently from older single-stage equipment.

Ask the manufacturer or installer how the particular system handles recovery and auxiliary heat.

Do Not Use Auto Mode Carelessly

ENERGY STAR advises consumers to use dedicated heating or cooling modes rather than allowing unnecessary automatic switching between heating and cooling during unusual weather conditions.

This can be particularly relevant during spring and autumn when outdoor temperatures fluctuate.

Heat Pump Sound And Placement

Outdoor-unit placement affects both noise and serviceability.

Avoid positioning equipment where:

• Sound reflects directly toward a bedroom.
• Snow or debris can block airflow.
• Water repeatedly drains onto the equipment.
• Service access is restricted.
• Airflow is obstructed.

The manufacturer’s minimum clearances should always be followed.

Snow And Cold Weather Considerations

In snowy climates, outdoor-unit placement becomes particularly important.

The unit needs adequate clearance from snow accumulation and must be positioned so that melting and defrost water can drain appropriately.

Improper placement can create ice accumulation around the equipment.

Cold-climate equipment does not eliminate the need for sensible installation practices.

Heat Pump Buying Checklist

Before signing the contract, check every item below.

• ☐ Heating load calculated
• ☐ Cooling load calculated
• ☐ Outdoor design temperature identified
• ☐ Heating capacity checked at relevant low temperatures
• ☐ SEER2 checked
• ☐ EER2 checked
• ☐ HSPF2 checked
• ☐ COP checked where relevant
• ☐ ENERGY STAR status verified
• ☐ Cold Climate designation checked if needed
• ☐ Exact indoor/outdoor combination verified
• ☐ AHRI certification checked
• ☐ Existing ducts inspected
• ☐ Static pressure checked
• ☐ Electrical service evaluated
• ☐ Auxiliary heat strategy explained
• ☐ Thermostat compatibility verified
• ☐ Refrigerant identified
• ☐ Warranty documented
• ☐ Installation scope written clearly
• ☐ Commissioning included

Five Red Flags In A Heat-Pump Quote

Red Flag 1: “You Need Three Tons Because Your House Is 1,500 Square Feet.”

Square footage alone is not sufficient for proper sizing.

Red Flag 2: No Low-Temperature Capacity Information

If you live in a cold climate, the contractor should be able to explain what the equipment does at low outdoor temperatures.

Red Flag 3: No Exact Indoor/Outdoor Model Combination

Ask for the exact equipment combination rather than accepting only a product-family name.

Red Flag 4: No Duct Evaluation

If the existing ducts are being reused, they should be evaluated.

Red Flag 5: “The Heat Pump Is Maintenance-Free.”

Every mechanical HVAC system requires appropriate maintenance.

How To Compare Three Heat-Pump Quotes

Do not immediately compare the total prices.

First create a common list:

Which Heat-Pump Technology Fits Which Home?

Frequently Asked Questions

What is the most important thing to consider when buying a heat pump?

Correct sizing and suitability for the house should come before brand or headline efficiency.

What size heat pump do I need?

You need a heating and cooling load calculation rather than a square-footage rule. The correct size depends on climate, insulation, windows, air leakage, occupancy and other building characteristics.

What is a good SEER2 rating?

ENERGY STAR’s current Version 6.2 minimum for qualifying residential split heat pumps is 15.2 SEER2, but a higher number is not automatically the best choice for every house.

What is a good HSPF2 rating?

The answer depends on climate and system type. ENERGY STAR’s current minimum for standard qualifying split systems is 7.8 HSPF2, while qualifying ducted cold-climate systems must reach at least 8.1 HSPF2.

What is a good COP for a heat pump?

COP must be considered together with the test temperature and operating condition. For cold climates, COP at 5°F is particularly informative.

What is the difference between SEER2 and HSPF2?

SEER2 measures seasonal cooling efficiency, while HSPF2 measures seasonal heating efficiency under standardized test conditions.

Should I buy a cold-climate heat pump?

If your home experiences regular winter temperatures near or below freezing, investigate cold-climate equipment and compare its low-temperature capacity and COP.

Can a heat pump replace my air conditioner?

Yes. A heat pump can provide both heating and cooling, eliminating the need for a separate conventional air conditioner when the system is properly designed.

Can a heat pump replace my gas furnace?

It can, depending on climate, building load, electrical infrastructure and the chosen system. Another option is a dual-fuel configuration that retains the furnace.

Can I keep my existing furnace?

Often yes. The furnace can potentially serve as auxiliary or backup heat in a dual-fuel system, provided the equipment is compatible.

Can I keep my existing ducts?

Possibly. The ducts should be inspected for size, leakage, insulation, static pressure and airflow before deciding to reuse them.

Are ductless heat pumps better than central heat pumps?

They solve different distribution problems. Ductless systems are particularly useful when ducts do not exist or when independent room zoning is desirable.

Are inverter heat pumps worth it?

Variable-speed inverter systems can provide better part-load control and potentially better comfort, but their value depends on the home’s load profile, installation quality and equipment cost.

Does a heat pump work below freezing?

Yes. Modern heat pumps can operate well below freezing. Cold-climate models are specifically evaluated for low-temperature performance.

Does a heat pump work at 5°F?

Many modern systems do. ENERGY STAR’s cold-climate designation specifically tests qualifying equipment at 5°F.

Will I need backup heat?

That depends on the home’s heating load, climate and the heat pump’s low-temperature capacity. Backup can be electric resistance, a gas furnace or another appropriate heat source.

What is auxiliary heat?

Auxiliary heat is supplemental heat used when the heat pump cannot provide enough heating capacity by itself or when the controls determine that additional heat is necessary.

What is emergency heat?

Emergency heat is a thermostat-selected mode on systems that have a suitable backup heat source. It generally forces the backup source to operate instead of relying on normal heat-pump operation.

Should I choose the highest SEER2 heat pump?

Not automatically. Compare the complete system, heating capacity, climate performance, installation cost, controls, warranty and expected operating conditions.

Is ENERGY STAR certification important?

It is a useful standardized qualification, particularly because current ENERGY STAR criteria include defined efficiency requirements and, for cold-climate models, verified low-temperature performance.

What is the most important question to ask an HVAC contractor?

Ask: “What is my calculated heating load, and how much heating capacity will this exact heat-pump system provide at my winter design temperature?”

Should I get three quotes?

Obtaining multiple detailed quotes can be useful, provided each contractor is quoting a comparable scope and provides the technical information needed for comparison.

Final Heat Pump Buying Checklist

Before purchasing, you should be able to answer all of these questions:

• What is my home’s heating load?
• What is my home’s cooling load?
• What is my local winter design temperature?
• What heating capacity does the system provide at that temperature?
• What does it provide at 5°F?
• Is it ENERGY STAR certified?
• Is it ENERGY STAR Cold Climate qualified if I need that capability?
• What are its SEER2, EER2 and HSPF2 ratings?
• What is its COP at relevant low temperatures?
• What is the exact indoor/outdoor matched combination?
• Can I verify the rating?
• Can my existing ducts handle the airflow?
• Does my electrical service support the installation?
• Will auxiliary heat be installed?
• When will auxiliary heat operate?
• What refrigerant does the system use?
• What thermostat is included?
• What warranty is included?
• Who will service the system?
• What commissioning measurements will be performed?

Final Takeaway

Buying a heat pump should not begin with the question, “Which brand is best?”

It should begin with:

“What does my house actually need?”

Once the heating and cooling loads are known, the rest of the decision becomes much clearer.

You can determine whether the home needs:

• A standard air-source heat pump
• A cold-climate heat pump
• A ducted variable-speed system
• A ductless mini-split
• A multi-zone system
• A dual-fuel system
• A geothermal heat pump

Then compare the exact equipment using standardized ratings and low-temperature performance.

Finally, evaluate the installation.

That final step is critical.

The efficiency printed on a heat-pump specification sheet is not the efficiency of the entire house.

The real system includes the building envelope, ducts, indoor equipment, outdoor unit, controls, electrical system and installer.

A properly sized heat pump with good distribution and professional commissioning can deliver the performance the homeowner paid for. An incorrectly sized or poorly installed premium system may not.

For homeowners who want to compare specific equipment after understanding the buying process, continue to our main guide:

Best Heat Pumps In The USA

For home-type-specific recommendations, see:

Best Heat Pumps For Different Homes In The USA

For very cold climates:

Best Cold Climate Heat Pumps In The USA

For geothermal systems:

Best Geothermal Heat Pumps In The USA

For ductless systems:

Best Ductless Mini Split Heat Pumps In The USA

For dual-fuel systems:

Best Dual Fuel Heat Pumps In The USA