Heat Pump vs. Gas Furnace in Colorado (2026)

Some people say heat pumps don't work in Denver. Others say gas furnaces are obsolete. Neither is right. The answer depends on your energy prices, your house, your ductwork, and whether you also need AC.

Below we run the numbers using current Xcel Energy Colorado prices, NOAA climate data for Denver, and published data for a real cold-climate heat pump.

How a gas furnace works: AFUE

A gas furnace burns natural gas in a sealed combustion chamber. A heat exchanger passes that heat into the air your blower pushes through the ducts. The efficiency rating is AFUE (Annual Fuel Utilization Efficiency): the share of the fuel's energy that ends up as heat in your home over a season.

• 80% AFUE is a standard-efficiency furnace. It vents hot exhaust up a metal flue, and many older Denver homes have one.
• 90–98% AFUE is a condensing furnace. A second heat exchanger pulls heat out of the exhaust, which leaves the house cool enough to vent through PVC pipe. ENERGY STAR requires at least 97% AFUE for gas furnaces in northern states, Colorado included.

A furnace can never deliver more heat than the fuel it burns, so 100% is the ceiling. In exchange it delivers the same high-temperature heat whether it is 40°F or −10°F outside. The U.S. Department of Energy estimates the average gas furnace lasts about 21.5 years.

How a heat pump works: COP

A heat pump is an air conditioner that can run in reverse. Even at 10°F, outdoor air holds a lot of heat energy. The heat pump's refrigerant picks up that heat at the outdoor coil, the compressor raises its temperature, and the indoor coil releases it into your ducts. In summer a reversing valve sends heat the other way, and the unit works as your central AC.

How a heat pump heats your home

Heat pump efficiency is measured as COP (coefficient of performance): units of heat delivered per unit of electricity used. A COP of 3 means 3 kWh of heat for every 1 kWh off your meter, or 300% efficiency. That is possible because the electricity moves heat rather than creating it. The U.S. Department of Energy notes that a properly installed heat pump can deliver up to three times more heat energy than the electricity it consumes.

COP is not fixed: the colder it is outside, the harder the compressor works, so COP and capacity both fall. Three more terms:

• Variable-speed (inverter) compressor. It ramps up and down instead of switching on and off, running gently on mild days and at full output on cold nights. This is the main reason modern units beat older heat pumps.
• Defrost. Frost builds on the outdoor coil in cold, humid weather, so the unit briefly reverses to melt it. DOE recommends "demand defrost" controls that defrost only when needed.
• Backup heat. Electric resistance strips (COP 1) or a gas furnace (dual-fuel) cover the coldest hours and defrost cycles.

For the cold-weather side in more detail, see Do heat pumps work in a Denver winter?

Denver's climate and the balance point

NOAA's 1991–2020 normals for Denver International Airport show:

• December and January average about 31–32°F, with normal lows around 18–19°F.
• About 5,862 heating degree days a year.
• The ENERGY STAR / ASHRAE 99% heating design temperature for Denver County is 3°F: only about 1% of hours are colder.

Denver monthly normal temperatures vs. heat pump backup threshold

Normal averageNormal daily low

The balance point is the outdoor temperature at which a heat pump's maximum output exactly matches your home's heat loss. Above it, the heat pump carries the house alone. Below it, backup heat makes up the difference.

Older single-speed heat pumps lose capacity quickly as it gets cold. Pacific Northwest National Laboratory notes that their efficiency drops below about 35°F, which is why they usually need significant backup heat. A cold-climate unit changes that.

As an example, take a Mitsubishi P-Series H2i 3.5-ton ducted system (PUZ-HA42NKA1). Its NEEP cold-climate listing shows a maximum of 48,000 Btu/h at 47°F, 17°F and 5°F. Now picture a house that loses 55,000 Btu/h at a 3°F design temperature. That loss shrinks in a straight line to zero at about 65°F. The heat pump carries this house alone down to roughly 11°F. Denver's average January low is warmer than that, so backup heat would only run during real cold snaps. (The sizing math is in our Manual J sizing guide.)

There is also an economic balance point, below which gas heat is cheaper. With Colorado's cheap gas, it sits well above the thermal one.

Operating cost: the math at Xcel Energy prices

Colorado gas is cheap relative to electricity, so the comparison is closer than the "300% efficient" pitch suggests.

Prices we used (as of November 2026)

• Natural gas: about $1.05 per therm, all-in. EIA reports Colorado's average residential gas price at $10.41, $10.57 and $10.99 per Mcf for December 2025 through February 2026. At about 1.036 million Btu per Mcf (EIA), that is roughly $1.03 per therm. Xcel's 2025 gas rate case raised the average residential bill about 8.6% from Oct. 6, 2026, so we round up to $1.05. The price also changes quarterly with Xcel's Gas Cost Adjustment.
• Electricity: about 16¢ per kWh. Xcel's 2025 electric rate case notice lists a typical residential bill of $100.10 for 601 kWh (about 16.7¢ all-in). Regulators approved an increase of about $5 a month in August 2026, effective at the end of December. Winter energy charges are lower than summer ones, so we use 16¢ for heating.

These averages include fixed charges, so your cost per additional unit is a bit lower. Plug in your own bills.

The example home

Assume a home whose 95% furnace burns 600 therms a year for heating. That is an assumption for illustration, not a Denver average, so check your own winter gas bills. The house needs 570 therms of delivered heat (600 × 0.95). That equals 57 million Btu, or about 16,700 kWh of heat (1 therm = 29.3 kWh).

System	How we calculated	Energy used	Annual heating cost
95% AFUE gas furnace	570 ÷ 0.95 = 600 therms × $1.05	600 therms	≈ $630
80% AFUE gas furnace (older)	570 ÷ 0.80 = 713 therms × $1.05	713 therms	≈ $750
Heat pump, seasonal COP 3.0, 12¢/kWh (mostly off-peak)	16,700 kWh ÷ 3.0 × $0.12	5,570 kWh	≈ $670
Heat pump, seasonal COP 3.0, 16¢/kWh	16,700 kWh ÷ 3.0 × $0.16	5,570 kWh	≈ $890
Heat pump, seasonal COP 2.5, 16¢/kWh	16,700 kWh ÷ 2.5 × $0.16	6,680 kWh	≈ $1,070
Electric baseboard or furnace (COP 1.0), 16¢/kWh	16,700 kWh × $0.16	16,700 kWh	≈ $2,670

Estimated annual heating cost, example Denver home

What this means:

• Versus a new 95% furnace, a heat pump usually costs more to run in Xcel territory, roughly $250–$450 more per year in this example at average electric prices.
• Versus an old 80% furnace, the gap narrows to about $140–$320. A heat pump that runs mostly on cheaper off-peak power can roughly break even.
• Versus electric resistance heat (baseboards, an electric furnace, or a boiler), a heat pump saves well over $1,500 a year here. That is the clearest win.

The break-even COP

A shortcut for any price: one therm of gas in a 95% furnace delivers 27.8 kWh of heat, so at $1.05/therm gas heat costs about 3.8¢ per kWh of heat. Divide your electric rate by that number to get the COP a heat pump needs just to tie:

• At 16¢/kWh: break-even COP ≈ 4.2 against a 95% furnace, or about 3.6 against an 80% furnace.
• At 12¢/kWh: break-even COP ≈ 3.2 against a 95% furnace, or about 2.7 against an 80% furnace.

For comparison, the Mitsubishi system above is listed at a COP of about 3.1–4.1 at 47°F and about 2.1–2.3 at 17°F. So at average electric rates, gas wins on cost in cold weather, and the heat pump is close to even on mild days. Time-of-use pricing matters here. Since October 2025, Xcel's residential on-peak window has been 5–9 p.m. on non-holiday weekdays. The approved changes raised winter on-peak prices by nearly 40% and cut off-peak prices by about 12%. A heat pump that does most of its work overnight and midday pays the lower rates.

Upfront cost

The ranges below are typical market ranges from published cost guides, not MrFixer quotes. Your price depends on the equipment, ductwork, electrical service and the rebates you qualify for.

• Heat pump, installed, Denver: about $5,600–$14,500, average about $10,000 (Angi, updated July 2026). Carrier's 2026 guide gives a wider national range of $6,000–$25,000, with high-efficiency systems at the upper end. Cold-climate, variable-speed ducted systems tend to land in the upper part of these ranges.
• Gas furnace, installed, Denver: about $2,900–$6,900, average about $4,900 (Angi, updated February 2026).
• Furnace plus central AC replaced together: about $5,000–$12,500, average about $7,500 nationally (Angi, 2026).

The fair comparison is usually heat pump vs. furnace + AC, since a heat pump is also your air conditioner. Heat pump jobs can add electrical or duct upgrades. See Heat pump installation cost in Denver for a detailed breakdown.

Comfort: what it actually feels like

• Furnaces deliver very warm air in short bursts, so temperatures swing between cycles.
• Variable-speed heat pumps deliver cooler air almost continuously. Temperatures stay more even and the system is quieter, though some people miss the "blast of hot air."
• Badly sized or ducted heat pumps feel drafty, so proper Manual J sizing and airflow matter more than the brand.

Air conditioning comes with it

A furnace only heats; a heat pump is also your central AC. If you have no AC, or yours is near the end of its life, that alone can tip the decision. Our example system is listed at a cooling COP of about 3.1 at full load on a 95°F day and up to 5.1 at part load.

Lifespan and maintenance

• Gas furnace: about 21.5 years on average (DOE estimate).
• Heat pump: about 15 years on average (DOE estimate), partly because it runs in both seasons.

Both need annual maintenance (combustion and CO checks for furnaces; coils, charge and defrost checks for heat pumps). We handle both: heat pump repair and furnace repair.

Emissions

Burning natural gas releases about 116.7 lb of CO₂ per million Btu (EIA). A 95% furnace therefore emits about 123 lb of CO₂ per million Btu of delivered heat. Colorado's power plants emitted an average of 958 lb of CO₂ per MWh in 2024 (EIA). Using that figure:

• Heat pump at COP 3.0: about 94 lb per million Btu delivered, roughly 24% less than the furnace.
• Heat pump at COP 2.5: about 112 lb, roughly 9% less.

For the example home: about 7,000 lb of CO₂ a year with gas versus 5,300–6,400 lb with a heat pump. These are estimates using the statewide average, excluding methane leakage.

Colorado is also tightening rules on gas appliances. Under HB23-1161, new residential furnaces and water heaters sold in the state from Jan. 1, 2026 must meet lower nitrogen-oxide (NOx) emission requirements or qualify through ENERGY STAR. See Colorado's gas furnace NOx rules for what that means if you are replacing a furnace.

Rebates and tax credits (overview)

Incentives can close much of the upfront gap. As of November 2026:

• Federal 25C tax credit: ended. The IRS confirms the energy efficient home improvement credit is not allowed for property placed in service after Dec. 31, 2025. Older cost guides that still mention it are out of date.
• Colorado heat pump tax credit: $1,000 for air-source heat pumps installed in 2026 (down from $1,500). It is claimed by a registered contractor, who must pass at least $333 of it to you as a "State of Colorado Heat Pump Discount" on your invoice. The system must be ENERGY STAR certified, AHRI-matched, and designed to meet at least 80% of your annual heating needs.
• Xcel Energy rebates for qualifying heat pumps. Amounts and requirements change, so check before you sign.
• Power Ahead Colorado (DRCOG): a $1,500 rebate for ENERGY STAR cold-climate heat pumps installed by a verified program contractor across the Denver region, launched in 2026. It can be combined with other incentives.
• City programs in Denver, Boulder and other Front Range communities, plus income-qualified programs, can add more.

Rules change often; confirm current terms. Details: Colorado heat pump rebates and tax credits. Our rebate assistance service can help with the paperwork.

When a gas furnace still wins

• Your central AC is in good shape and only the furnace failed.
• Lowest operating cost is the priority on average Xcel rates. A 95%+ furnace is hard to beat.
• Your electrical service or ducts would need expensive upgrades for a heat pump.
• You live in a colder microclimate, such as the foothills, with design temperatures well below Denver's.

Then a high-efficiency furnace is a solid choice. See furnace installation.

When a heat pump wins

• You are heating with electric resistance (baseboards, an electric furnace, or a boiler) or propane.
• You need to replace or add AC anyway.
• You have rooftop solar, or you can run the heat pump mostly off-peak.
• You want to cut emissions or plan to go all-electric and eventually drop the gas service and its fixed monthly charge.
• Your home is well insulated and air-sealed, so a cold-climate unit can carry nearly all the load.

Homes without ducts, or additions and finished basements, are often best served by a ductless mini-split. See also mini-split heat pumps for older homes.

When dual-fuel wins

Dual-fuel pairs a heat pump with a gas furnace and switches between them at a set outdoor temperature. For many existing Denver homes it captures most of the benefit with little risk:

• Efficient AC, plus heat pump heat on mild fall and spring days.
• The furnace covers cold snaps and defrost, so no electric strip heat.
• The switchover can favor cost (gas sooner) or emissions (heat pump longer). Given the break-even COPs above, a cost-focused setting switches to gas at a fairly mild temperature.
• With a newer furnace, you can simply replace the AC with a heat pump.

More detail in Dual-fuel heat pump + furnace systems in Colorado.

Decision table

Your situation	Usually best fit	Why
Furnace failed, AC under ~10 years old	High-efficiency gas furnace	Lowest operating cost; keeps the working AC
Furnace and AC both near end of life, good ducts	Dual-fuel or cold-climate heat pump	One outdoor unit does both jobs; gas backup if wanted
Newer furnace, AC failed	Heat pump added to the existing furnace (dual-fuel)	Costs about the same as a new AC; adds efficient shoulder-season heat
Electric baseboard or electric furnace	Cold-climate heat pump or mini-split	Cuts heating electricity by about two-thirds
No ducts, or an addition or basement	Ductless mini-split	No ductwork needed; room-by-room control
Want all-electric or lowest emissions	Cold-climate heat pump, sized for heating	Lower CO₂ on Colorado's grid; drops the gas fixed charge if you disconnect
Tight budget, small or undersized ducts, limited electrical capacity	Gas furnace (plus AC if needed)	Lowest installed cost; fewer upgrades

How to get a real answer for your house

A good estimate includes a room-by-room load calculation, a duct and electrical check, your actual usage, and the rebates you qualify for. MrFixer Heating & Cooling installs and services heat pumps, furnaces, mini-splits and dual-fuel systems across the Denver metro. We are based in Castle Pines, licensed and insured, and we offer free in-home estimates and financing. Call (720) 466-7983 or request an estimate. If you are mainly after lower bills, ask about high-efficiency system upgrades.

Frequently asked questions

• Is a heat pump cheaper to run than a gas furnace in Denver? Usually not compared with a new 95% furnace at current Xcel prices (about $1.05/therm and 16¢/kWh). A heat pump needs a seasonal COP above about 4.2 to tie, which no unit reaches through a whole Denver winter. It can be close against an old 80% furnace or with off-peak rates, and it is far cheaper than electric resistance heat.
• Will a heat pump keep my house warm when it's below zero? A properly sized cold-climate heat pump keeps producing heat well below 0°F. ENERGY STAR cold-climate models must reach a COP of at least 1.75 at 5°F and keep at least 70% of their rated capacity there. Most systems still include electric or gas backup for the coldest hours and defrost cycles.
• Is the 30% federal tax credit still available for heat pumps? No. The IRS says the 25C energy efficient home improvement credit is not allowed for property placed in service after December 31, 2025. Colorado's heat pump tax credit, Xcel Energy rebates and regional programs such as Power Ahead Colorado still apply in 2026.
• What is dual-fuel and is it worth it in Colorado? Dual-fuel pairs a heat pump with a gas furnace and switches between them by outdoor temperature. In Denver it gives you AC plus efficient mild-weather heat, while cheap gas covers cold snaps. It is often the best fit when you are replacing an AC but your furnace still has years left.
• Do I need new ductwork for a heat pump? Not always, but heat pumps deliver cooler air than furnaces, so they need adequate airflow (DOE cites roughly 400–500 cfm per ton). A contractor should measure your ducts and static pressure before quoting. Homes without ducts can use ductless mini-splits.

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