Best Gas Furnaces for Cold Climates in the USA

Best Gas Furnaces for Cold Climates at a Glance

Note: Exact AFUE, capacity, staging, blower configuration, warranty, and availability can vary by model number and installation region. Always compare the exact AHRI-certified equipment combination rather than relying only on the product family name.

Our Top Pick: Carrier Infinity 98

The Carrier Infinity 98 Gas Furnace is one of the strongest choices for homeowners who want premium performance in a cold climate.

Carrier lists the current Infinity 98 model 59MN7 at up to 98.5% AFUE. It uses a modulating gas valve capable of adjusting heat output in 1% increments and a variable-speed blower. Carrier also describes the system as using Greenspeed intelligence for more precise temperature control and quieter operation.
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Why it is excellent for cold climates

• Up to 98.5% AFUE
• Modulating gas valve
• Variable-speed blower
• Precise heat-output adjustment
• Excellent temperature consistency
• Quiet operation
• Strong integration with Carrier’s communicating controls

A modulating furnace can operate at a much lower firing rate than a conventional single-stage furnace. During many heating conditions, that allows the furnace to run for longer periods at lower output rather than repeatedly turning fully on and off.

This is particularly attractive in cold climates because the furnace may operate for long periods throughout the winter.

Potential disadvantages

• Higher purchase price
• More sophisticated controls
• More complex installation
• Premium replacement parts can be more expensive
• Best results usually require proper system matching and commissioning

Best for: Homeowners who want premium comfort, very high efficiency, quiet operation, and advanced temperature control.

Best Maximum-Efficiency Furnace: Lennox SLP99

The Lennox SLP99 is aimed at homeowners who want to minimize fuel consumption and maximize furnace efficiency.

Current equipment databases list SLP99 configurations at approximately 99% AFUE, depending on the exact model and configuration. The furnace uses modulating operation and a variable-speed blower.

A furnace approaching 99% AFUE wastes very little of its fuel input compared with an older 80% furnace. That difference can become significant in a cold climate where the furnace operates frequently.

Advantages

• Extremely high efficiency
• Modulating heating
• Variable-speed airflow
• Excellent temperature control
• Designed for premium comfort

Disadvantages

• High equipment cost
• Installation can be more complicated
• Requires condensate management
• More sophisticated electronics and controls

Best for: Homeowners in very cold climates who expect high annual furnace usage and want maximum efficiency.

Best Two-Stage Furnace for Cold Climates: Trane S9V2

A two-stage furnace can be a particularly attractive compromise between a basic single-stage furnace and an expensive modulating system.

The Trane S9V2 is designed around two-stage heating and variable-speed airflow. This allows the furnace to operate at a lower heating output for much of the season and use its higher stage when the home needs more heat.

Two-stage heating can reduce temperature swings and increase the amount of time the furnace operates at a lower output.

Why two-stage can be better than single-stage in cold climates

Imagine a home that needs only moderate heat on a winter day when the outdoor temperature is 35°F but requires substantially more heat when the temperature falls to 5°F.

A single-stage furnace has essentially one normal heating output. A two-stage furnace can use a lower stage for the lighter load and reserve the higher stage for colder conditions.

This can improve comfort while avoiding some of the additional complexity and cost of a fully modulating furnace.

Best for: Homeowners who want excellent comfort and efficiency without paying the highest price for a modulating system.

Best Value High-Efficiency Furnace: Goodman GMVC97

The Goodman GMVC97 is worth considering when the goal is high efficiency and variable-speed operation without moving into the most expensive premium furnace categories.

GMVC97 configurations are commonly rated around 97% AFUE and use two-stage gas heating with a variable-speed ECM blower.

The major attraction is the combination of:

• High AFUE
• Two-stage heating
• Variable-speed airflow
• Competitive equipment pricing
• Broad availability through HVAC contractors

The final installed price matters much more than the furnace’s advertised equipment price, however. A less expensive furnace installed incorrectly is not a good value.

Best for: Homeowners who want strong efficiency and comfort while keeping equipment costs under control.

Why High-Efficiency Furnaces Are Better for Cold Climates

AFUE means Annual Fuel Utilization Efficiency. It describes how much of the furnace’s fuel input is converted into useful heat over the annual test cycle.

Carrier describes its Infinity 98 as reaching up to 98.5% AFUE, compared with the 80% minimum efficiency category for modern gas furnaces.
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The savings potential is particularly important in northern states because the furnace may operate much more frequently than it would in a mild southern climate.

80% vs. 95%+ Furnaces for Cold Climates

For a home that experiences long winters, a 95%+ furnace is often worth serious consideration. However, the economics depend on local gas prices, heating demand, installation cost, and how long you intend to own the home.

What Makes a Furnace Good for a Cold Climate?

A cold-climate furnace should be evaluated on several characteristics rather than AFUE alone.

1. High AFUE

A high AFUE reduces the amount of fuel required to provide a given amount of heat.

2. Two-stage or modulating operation

Variable heating output can improve comfort and allow the furnace to operate at lower output when the heating load is relatively small.

3. Variable-speed blower

A variable-speed blower can provide more precise airflow and smoother operation than a basic fixed-speed blower.

4. Correct sizing

Even the most efficient furnace can perform poorly if it is significantly oversized.

5. Good heat exchanger design

The heat exchanger is a critical component because it separates combustion gases from the air delivered into the home.

6. Proper venting

High-efficiency condensing furnaces require venting designed for the furnace’s combustion system and condensate characteristics.

7. Experienced installation

Installation quality is one of the most important variables in furnace performance.

What AFUE Should You Choose in a Cold Climate?

For most northern U.S. homes, we would generally focus on the following range:

For many homeowners, a 95%–97% two-stage furnace with a variable-speed blower is the sweet spot.

A 98%–99% modulating furnace can make sense for homeowners who prioritize maximum efficiency and comfort and are comfortable paying more for the equipment and installation.

Two-Stage vs. Modulating Furnaces

For many cold-climate homeowners, two-stage heating offers the best balance. Modulating furnaces are more attractive when maximum comfort, quiet operation, and efficiency are higher priorities than minimizing upfront cost.

Why Variable-Speed Blowers Matter in Cold Weather

The blower is responsible for moving heated air through the home’s duct system.

A variable-speed blower can make the heating system feel more refined because airflow can be adjusted over a wider range.

Potential benefits include:

• More consistent airflow
• Quieter operation
• Better temperature distribution
• Better compatibility with advanced heating stages
• More gradual changes in airflow
• Improved comfort during long heating cycles

The blower also matters when the furnace is used with central air conditioning during summer.

Cold Climate Furnace Sizing

Furnace sizing is arguably more important than choosing between two major brands.

A contractor should ideally perform a proper Manual J load calculation or an equivalent recognized heating-load calculation rather than selecting the furnace solely from the home’s square footage.

Heating load depends on:

• Outdoor design temperature
• Indoor design temperature
• Insulation levels
• Window performance
• Air leakage
• Ceiling height
• Home orientation
• Building materials
• Floor area
• Number of exterior walls
• Local climate

Why Oversizing Is a Problem in Cold Climates

It may seem logical to install a larger furnace because winters are extremely cold. That can actually create problems.

A furnace that is substantially oversized may satisfy the thermostat too quickly. Instead of running longer, smoother cycles, it may repeatedly start and stop.

Potential problems include:

• Short cycling
• Uneven temperatures
• Reduced comfort
• More frequent starts
• Greater mechanical stress
• Less effective blower operation

This is particularly important with single-stage furnaces because the burner has only one normal firing level.

A two-stage or modulating furnace can tolerate variations in heating demand more gracefully, but correct sizing remains essential.

Best Furnace Type for Minnesota

Minnesota homes can experience long and severe heating seasons. A high-efficiency condensing furnace is generally a strong starting point for a new installation.

A 95%–98% two-stage or modulating furnace with a variable-speed blower is particularly attractive.

Premium choices such as the Carrier Infinity 98 can provide up to 98.5% AFUE and modulating operation.
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Best Furnace Type for Wisconsin

Wisconsin has substantial winter heating demand, making efficiency and comfort important.

A 95%–97% two-stage furnace is often a strong value proposition. Homeowners who want premium comfort can step up to a modulating furnace.

Best Furnace Type for Michigan

Michigan homeowners should generally consider a high-efficiency condensing furnace when replacing an older system.

Two-stage operation paired with variable-speed airflow offers a particularly attractive combination of comfort, efficiency, and cost.

Best Furnace Type for Illinois

Illinois has significant variation between northern and southern parts of the state. Northern Illinois homes can benefit from high-efficiency equipment, while homeowners farther south may find a slightly lower-cost high-efficiency system sufficient.

A properly sized 95%–97% furnace is a strong general-purpose choice.

Best Furnace Type for Colorado

Colorado’s elevation creates an additional consideration: combustion and furnace capacity can be affected by altitude.

The selected furnace must be approved and configured for the installation altitude. Contractors should follow the manufacturer’s altitude requirements rather than simply installing a standard furnace configuration.

Low-NOx requirements can also apply in certain Colorado jurisdictions, so homeowners should verify local requirements before choosing equipment.

Best Furnace Type for New England

New England homes can experience long heating seasons and very cold outdoor temperatures.

A 95%+ condensing furnace with two-stage or modulating operation and a variable-speed blower is generally worth considering.

Older homes should receive particular attention to insulation, air leakage, ductwork, and heating-load calculations.

Natural Gas vs. Propane Furnaces for Cold Climates

Many furnace platforms can be configured for propane with the appropriate manufacturer-approved conversion components and procedures.

Propane is particularly relevant in rural areas where natural-gas distribution is unavailable.

Cold Climate Furnace Venting

High-efficiency furnaces are condensing appliances. They extract enough heat from combustion gases that water vapor condenses inside the furnace or venting system.

This means the installation needs:

• Approved vent materials
• Proper vent termination
• Condensate drainage
• Freeze protection where required
• Correct vent slope
• Proper combustion-air arrangements

In very cold climates, outdoor vent termination and condensate management deserve particular attention because freezing can interfere with furnace operation.

Why Condensate Management Matters

A high-efficiency furnace produces condensate as part of the combustion process.

If the condensate drain becomes blocked or freezes, the furnace may shut down as a safety measure.

The installation should therefore account for:

• Drain routing
• Drain slope
• Condensate pump requirements
• Freezing risk
• Drain termination

What Is the Best AFUE for a Cold Climate?

There is no universal “best” AFUE number.

For many homeowners, 95%–97% AFUE represents an excellent balance between efficiency and installation cost.

A 98%–99% furnace becomes more attractive when:

• The home has very high annual heating demand.
• Gas prices are relatively high.
• The homeowner expects to remain in the house for many years.
• The installation premium is reasonable.
• Premium comfort is important.

Does a 98% Furnace Really Save More Than a 95% Furnace?

Yes, but the difference is smaller than the difference between an 80% and 95% furnace.

For example, consider a simplified comparison using 100 units of fuel input:

• 80% AFUE → approximately 80 units of useful heat
• 95% AFUE → approximately 95 units of useful heat
• 98% AFUE → approximately 98 units of useful heat

The jump from 80% to 95% is substantially larger than the jump from 95% to 98%.

Therefore, homeowners should not automatically pay a huge installation premium simply to move from 95% to 98% AFUE.

Is a 99% Furnace Worth It?

Sometimes.

A 99%-class furnace can be attractive for a very cold climate with high annual heating usage. But the economic case depends on the price difference between the furnace options.

If upgrading from a 95% furnace to a 99% furnace costs several thousand dollars more, the fuel savings may take a long time to recover that additional investment.

If the upgrade is relatively inexpensive, however, the higher efficiency can be more compelling.

Gas Furnace Operating Cost in a Cold Climate

Your actual annual heating bill depends on much more than furnace efficiency.

Important factors include:

• Natural gas price
• Annual heating degree days
• Home insulation
• Air leakage
• Heating-load size
• Thermostat settings
• Furnace AFUE
• Duct losses
• Furnace maintenance

A highly efficient furnace cannot compensate for a poorly insulated house with severe air leakage.

Improve the Home Before Buying the Biggest Furnace

If your home has poor insulation, it may be tempting to compensate by installing a larger furnace.

That is usually the wrong approach.

Consider improving:

• Attic insulation
• Wall insulation
• Air sealing
• Weatherstripping
• Window performance
• Duct sealing
• Basement or crawl-space insulation

Reducing the home’s heating load can allow a smaller, properly sized furnace to provide adequate heat.

Variable-Speed vs. Fixed-Speed Furnace Blowers

Should You Buy a Modulating Furnace for a Cold Climate?

If you have a large heating load and want premium comfort, a modulating furnace can be an excellent choice.

Carrier’s Infinity 98 is a good example. Its gas valve can adjust output in 1% increments when paired with the appropriate Infinity control.
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The main advantage is not simply fuel savings. Modulation can allow the furnace to better match the home’s actual heating requirement, potentially producing longer cycles and smaller temperature fluctuations.

The tradeoff is higher equipment and installation cost.

Single-Stage vs. Two-Stage vs. Modulating for Cold Climates

Best Cold-Climate Furnace by Budget

Under a tight budget

Prioritize correct sizing, a reputable manufacturer, reasonable efficiency, and an excellent installer rather than chasing the highest AFUE number.

Mid-range budget

A 95%–97% two-stage furnace with a variable-speed blower is an excellent target.

Premium budget

Consider a 97%–99% modulating furnace with variable-speed airflow and advanced controls.

Best Furnace for an Older Home

Older homes can have very different heating requirements from modern homes.

Before replacing the furnace, check whether the current system is oversized.

If the house has subsequently received insulation and air-sealing improvements, the old furnace may now be substantially larger than necessary.

A new load calculation is therefore especially valuable in an older home.

Best Furnace for a New Construction Home

New construction typically has lower heating loads because of improved insulation, windows, and air sealing.

This makes proper sizing extremely important. A high-efficiency two-stage or modulating furnace may operate at relatively low output for much of the winter.

Furnace Brands Worth Considering

Several major manufacturers have competitive high-efficiency products for cold climates.

• Carrier
• Trane
• Lennox
• Goodman
• Rheem
• Amana
• York
• American Standard

Brand reputation should not be the only selection criterion. Dealer quality, model-specific warranty, parts availability, installation quality, and the contractor’s experience with the particular furnace can be equally important.

Why the Installer Matters So Much

A furnace is not a plug-and-play appliance.

The installer must correctly handle:

• Gas pressure
• Combustion setup
• Vent sizing
• Condensate drainage
• Electrical connections
• Airflow
• Return-air sizing
• Supply-air configuration
• Thermostat configuration
• Furnace commissioning

A premium furnace installed incorrectly can perform worse than a less expensive furnace installed correctly.

Questions to Ask Your HVAC Contractor

1. What is my home’s calculated heating load?
2. What is the furnace’s exact model number?
3. What is its AHRI-certified efficiency?
4. Is it single-stage, two-stage, or modulating?
5. What type of blower does it use?
6. Why did you choose this furnace size?
7. What venting changes are required?
8. How will condensate be handled?
9. Is the furnace rated for my home’s altitude?
10. Does my location have special emissions requirements?
11. What does the manufacturer’s warranty cover?
12. What labor warranty do you provide?
13. Will you commission the furnace after installation?
14. Will you verify gas pressure and airflow?

How to Compare Furnace Quotes

Never compare contractors based solely on the total price.

Put the proposals side by side and compare:

Cold Climate Furnace Maintenance

Furnace maintenance becomes especially important when the equipment operates heavily throughout winter.

Before winter

• Replace the air filter.
• Inspect the burners.
• Inspect the heat exchanger.
• Check venting.
• Check condensate drainage.
• Check blower operation.
• Verify gas pressure.
• Inspect electrical connections.
• Verify thermostat operation.

During winter

• Keep outdoor intake and exhaust terminals clear.
• Do not block return-air registers.
• Monitor unusual noises.
• Check for repeated short cycling.
• Replace dirty filters promptly.

Common Cold-Climate Furnace Problems

Frozen condensate drain

Condensing furnaces produce water during operation. Improperly routed or exposed condensate drains can freeze in severe weather.

Blocked intake or exhaust

Snow and ice can obstruct exterior vent terminals. The location and installation of the terminals should account for local weather conditions.

Dirty air filter

A severely restricted filter can reduce airflow and cause furnace safety controls to shut the system down.

Oversized furnace

Oversizing can cause short cycling and uncomfortable temperature swings.

Can a Gas Furnace Keep Up During Extreme Cold?

A properly sized furnace should be selected around the home’s local winter design conditions.

However, there is a difference between the design temperature and the most extreme temperature that might occur.

If outdoor temperatures fall significantly below the design condition, even a correctly sized furnace may operate continuously.

That is not necessarily a problem. Continuous operation during exceptionally cold weather can be preferable to repeatedly cycling on and off.

Gas Furnace vs. Heat Pump in Cold Climates

A gas furnace is not the only heating option for northern homes. Cold-climate heat pumps have improved considerably, and dual-fuel systems can combine a heat pump with a gas furnace.

A dual-fuel system can use the heat pump during conditions where it is economically advantageous and switch to the gas furnace under colder conditions or according to the system’s control strategy.

However, homeowners who already have natural gas service may still prefer a gas furnace because of its strong heat output and familiarity.

Is Dual Fuel Better Than a Gas Furnace?

Not necessarily for every home.

Dual fuel adds another heating source and additional equipment. It can be attractive where electricity and gas prices make heat-pump operation economical for much of the season.

If simplicity is the priority, a high-efficiency gas furnace remains an excellent option.

Best Gas Furnace for Extreme Cold

For extremely cold climates, our preferred configuration is:

1. 95%–99% AFUE condensing furnace
2. Two-stage or modulating gas valve
3. Variable-speed ECM blower
4. Correctly calculated heating capacity
5. Proper cold-weather vent termination
6. Protected condensate drainage
7. Professional commissioning

A premium modulating model such as the Carrier Infinity 98 provides this type of configuration, with up to 98.5% AFUE and a variable-speed blower.
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Best Gas Furnace for Most Cold-Climate Homes

For the average homeowner, we would not automatically recommend the most expensive 98%–99% modulating furnace.

Instead, a 95%–97% two-stage furnace with a variable-speed blower is often the strongest overall balance.

It provides:

• High efficiency
• Good cold-weather performance
• Better comfort than single-stage heating
• Lower cost than many modulating systems
• Good airflow control

Our Ranking

These rankings should be treated as a buying framework rather than an absolute reliability ranking. The exact model, contractor, installation quality, warranty, and local parts/service availability can change which furnace is the better choice for a particular home.

Final Verdict

The best gas furnaces for cold climates are generally high-efficiency condensing furnaces with two-stage or modulating heating and variable-speed blowers.

For homeowners who want the highest level of comfort and efficiency, the Carrier Infinity 98 is one of the strongest premium options. Carrier rates the current 59MN7 at up to 98.5% AFUE and equips it with modulating gas control and a variable-speed blower.
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For maximum efficiency, the Lennox SLP99 is worth considering. For a better balance between price and sophisticated heating, a 97%-class two-stage furnace such as the Trane S9V2 or Goodman GMVC97 can be a more practical choice.

Most homeowners do not need to buy the furnace with the highest possible AFUE. Moving from an old 80% furnace to a modern 95%–97% system can provide a much more meaningful efficiency improvement than spending a large additional amount simply to move from 97% to 99%.

The most important decision, however, is proper sizing and installation. Ask contractors to calculate your home’s heating load, provide the exact furnace model number, explain why the selected capacity is appropriate, and provide a complete written installation proposal.

For a typical cold-climate U.S. home, our target specification would be:

• 95%–97% AFUE
• Two-stage gas valve
• Variable-speed ECM blower
• Properly sized heating capacity
• Cold-weather venting and condensate protection
• Experienced local installer

If budget is less important than maximum comfort and efficiency, move up to a 98%–99% modulating furnace.

Frequently Asked Questions

What is the best gas furnace for a cold climate?

A high-efficiency 95%–99% condensing furnace with two-stage or modulating heating and a variable-speed blower is generally the best configuration for a cold climate. The Carrier Infinity 98 is a strong premium example.

Is 95% AFUE good enough for a cold climate?

Yes. A properly sized 95% furnace can be an excellent choice for a cold climate. The difference between 95% and 98% efficiency should be evaluated against the additional purchase and installation cost.

Is 80% AFUE enough for Minnesota?

An 80% furnace can provide adequate heat if correctly sized and installed, but a high-efficiency condensing furnace is generally worth considering in a location with a long heating season.

Is a two-stage furnace better for cold weather?

It can be. Two-stage operation allows the furnace to use lower output during less demanding conditions and higher output when more heat is needed. This can improve comfort and reduce unnecessary full-output operation.

Is a modulating furnace worth it?

It can be worth it for homeowners who value premium comfort and expect high furnace usage. However, a 95%–97% two-stage furnace can provide a better value for many households.

What is the highest AFUE gas furnace?

Current premium gas furnace models reach approximately 99% AFUE, depending on the exact model and rating configuration. Carrier’s current Infinity 98 reaches up to 98.5% AFUE.
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Does a high-efficiency furnace work better in extreme cold?

High AFUE primarily means the furnace converts more of its fuel into useful heat. Cold-weather performance also depends on proper sizing, installation, venting, combustion setup, and maintenance.

Should I buy the biggest furnace available?

No. Oversizing can cause short cycling and uneven temperatures. Furnace capacity should be based on a calculated heating load rather than square footage alone.

What blower is best for a cold climate furnace?

A variable-speed ECM blower is generally the premium choice because it provides more flexible airflow control and can improve comfort and noise performance.

Does furnace brand matter?

Yes, but installation quality often matters just as much. A well-installed furnace from a reputable manufacturer can outperform a premium model that was improperly sized or installed.

How long should a gas furnace last?

Lifespan varies substantially with equipment quality, installation, maintenance, operating hours, and environment. A properly maintained furnace can provide many years of service, but homeowners should not select equipment based solely on an expected lifespan.

What should I prioritize when buying a furnace for a northern state?

Prioritize correct sizing, high efficiency, two-stage or modulating operation, variable-speed airflow, proper venting, cold-weather condensate management, warranty coverage, parts availability, and an experienced installer.

Manufacturer References

Carrier’s current furnace information confirms that its Infinity series includes models reaching up to 98.5% AFUE, with the Infinity 98 using modulating gas technology and a variable-speed blower.

Carrier’s general gas-furnace guide also explains AFUE and distinguishes its Infinity, Performance, and Comfort furnace families.