Every few years a client asks the question, and it’s never simple: heat pump or gas furnace? Lately it’s coming up more often, and the honest answer has gotten more complicated. Heat pump technology has moved fast. Cold-climate models now keep heating efficiently at 5°F. Condensing gas furnaces have pushed AFUE ratings as high as 99%. Expired federal tax credits, changing rebate rules, and shifting energy prices have reshuffled the math in different directions depending on where a job is located. The right answer for a homeowner in Atlanta looks nothing like the right answer for one in Minnesota. Getting it wrong means a client either pays too much on their utility bills for the next 15 years or gets a system that can’t keep up during the coldest week of the year. This guide covers how these two systems actually compare on efficiency, operating cost, cold-weather performance, and the climate-zone realities that determine which one belongs in a given building.
How Each System Generates Heat
A gas furnace burns natural gas (or propane) to produce heat. Combustion happens inside the heat exchanger, warm air gets distributed through the duct system, and exhaust gases vent to the outside. High-efficiency condensing furnaces rated at 95-98% AFUE capture most of that heat energy before it leaves through the flue. Non-condensing 80% AFUE models are still common in warmer climates where the extra efficiency doesn’t pencil out against the upfront cost difference. Gas furnaces deliver supply air in the 120-140°F range, which most occupants recognize as that distinct blast of hot air from the registers.
A heat pump doesn’t produce heat. It moves heat. A refrigerant circuit extracts heat from outdoor air and transfers it indoors, running the same vapor-compression cycle as an air conditioner but in reverse. In summer, reverse the process: move heat from inside to outside. One piece of equipment covers both functions. Because a heat pump is transferring rather than generating heat, it can deliver more energy than it consumes electrically. The ratio of output to input is expressed as COP (Coefficient of Performance). A heat pump with a COP of 3 delivers 3 units of heat for every 1 unit of electricity. In percentage terms, 300% efficiency. No combustion system gets close to that figure at moderate temperatures.
There’s an important trade-off. A furnace’s efficiency is largely stable regardless of outdoor conditions. A heat pump’s COP drops as outdoor temperature falls, because there’s less heat in the air to extract. At 5°F, a heat pump that meets ENERGY STAR’s cold-climate criteria still delivers at least 1.75 units of heat per unit of electricity (COP 1.75), compared to 0.96 for a 96% AFUE gas furnace. Still more efficient, but the gap narrows significantly in extreme cold. That temperature dependency is the central variable in every heat pump vs. gas furnace decision.
Reading the Efficiency Labels: AFUE, HSPF2, and COP
Gas furnaces use AFUE (Annual Fuel Utilization Efficiency). A 96% AFUE rating means 96 cents of every dollar in gas burned becomes usable heat. The other 4 cents exits through the flue as exhaust. AFUE is a seasonal average, so it already accounts for startup and shutdown losses across a heating season.
Heat pumps use two metrics. HSPF2 (Heating Seasonal Performance Factor 2) measures seasonal heating efficiency, expressed as the ratio of BTUs delivered over a heating season to the watt-hours consumed. As of January 2023, HSPF2 replaced the older HSPF metric under updated DOE test procedures that more accurately reflect real duct system resistance. A unit rated at 8.8 HSPF under the old standard would rate approximately 7.5 HSPF2 under the new one. That 7.5 HSPF2 figure is the federal minimum for split-system heat pumps. ENERGY STAR certification requires at least 7.8 HSPF2 for split systems. COP gives a point-in-time snapshot: heat delivered divided by electricity consumed at a specific outdoor temperature. COP is most useful when comparing performance at extreme conditions, like 5°F or 17°F.
SEER2 applies to cooling performance. Because a heat pump handles both heating and cooling, comparing it to a gas furnace on cost requires accounting for the fact that a furnace needs a separate air conditioner. A fair total-system cost comparison pairs the gas furnace with an AC unit of comparable cooling capacity.
| Metric | System | What It Measures | Typical Range |
| AFUE | Gas Furnace | Annual heating efficiency as % of fuel converted to heat | 80% to 98% |
| HSPF2 | Heat Pump | Seasonal heating efficiency (BTU out / watt-hour in) | 7.5 to 12+ (federal min: 7.5; ENERGY STAR split min: 7.8) |
| COP | Heat Pump | Point-in-time efficiency ratio (heat out / electricity in) | 1.5 to 4.0+ depending on temp |
| SEER2 | Heat Pump / AC | Seasonal cooling efficiency | 14.3 to 25+ (federal heat pump min: 14.3; ENERGY STAR min: 15.2) |
Operating Cost: The Math That Actually Decides This
Efficiency ratings matter, but operating cost is what shows up on the utility bill. The real-world comparison comes down to one ratio: the price of electricity divided by the price of natural gas, with both measured per unit of heat energy, weighed against the equipment’s efficiency.
According to EIA electricity data, the average U.S. residential electricity price in 2025 was about $0.17/kWh. EIA natural gas data puts the average residential natural gas price at about $1.48/therm. Those are national averages. Regional variation is enormous. Parts of New England pay close to $0.30/kWh for electricity, while Idaho, in the Pacific Northwest, pays under $0.12/kWh. Gas prices swing widely too, from under $0.75/therm in Idaho to over $2.45/therm in Florida.
To compare the two, convert both prices to the same unit of energy. One therm equals about 29.3 kWh, so at 2025 national averages, one therm’s worth of electricity cost about $5.05, while a therm of natural gas cost about $1.48. That is a price ratio of about 3.4 to 1. To beat a furnace on operating cost, a heat pump’s COP has to be higher than that ratio multiplied by the furnace’s AFUE. Against a 96% AFUE furnace, that break-even COP is about 3.3 at national average prices. Against an older 80% AFUE furnace, it drops to about 2.7. Where electricity is cheap or gas is expensive, the ratio falls and the heat pump wins more easily. Where electricity is expensive and gas is cheap, a high-efficiency furnace is often cheaper to run, especially in the coldest months.
One factor that can tilt these comparisons against the heat pump: backup electric resistance strips. Many heat pump systems include electric resistance heating as a backup for extreme cold or rapid warm-up. Those strips typically draw 5-20 kW while running, depending on kit size, and are expensive to operate. A week-long polar vortex with outdoor temps consistently below 0°F can add meaningful cost to a heat pump’s monthly bill in cold climates. Cold-climate heat pump models minimize this by maintaining higher COP at low temperatures, reducing how often the backup strips engage.
| Climate Zone | Typical Seasonal COP | Gas Furnace Advantage? | Heat Pump Recommendation |
| Warm or mild (SE, TX, coastal PNW) | 3.0 to 3.4 | Rarely. Heat pump usually wins | Standard or cold-climate heat pump |
| Moderate (Mid-Atlantic, lower Midwest) | 2.5 to 3.0 | Depends on local utility rates | Cold-climate heat pump, evaluate rates |
| Cold (Zone 5-6, upper Midwest, New England) | 2.0 to 2.5 | Possible if gas is inexpensive | Cold-climate HP alone or dual-fuel setup |
| Very Cold (Zone 7, far north) | Below 2.0 at design temps | Likely for heating-only cost | Dual-fuel or gas furnace with separate AC |
Cold-Climate Heat Pumps: What’s Changed
The objection that heat pumps don’t work in cold weather is outdated. To earn ENERGY STAR’s cold-climate designation, a heat pump must hold a COP of at least 1.75 at 5°F and deliver at least 70% of its 47°F heating capacity at 5°F. Variable-speed inverter compressors and enhanced vapor injection circuits are what let cold-climate units keep heating efficiently at temperatures that would have stopped an earlier-generation heat pump entirely. Low-temperature operating limits vary by model, so check the rated operating range for the specific unit being specified.
The practical implication for contractors: the question shifts from ‘can it heat?’ to ‘what does it cost to heat?’ at the extreme design temperatures for that location. In Climate Zones 5 and 6, a dual-fuel setup often provides the best economic outcome: heat pump efficiency during the mild portions of the heating season, with the gas furnace taking over only when outdoor temps fall below a configured balance point. The right balance point depends on local rates: the furnace should take over once the heat pump’s COP drops below the break-even COP for that address. At 2025 national average prices, that break-even is about 3.3 against a 96% AFUE furnace and about 2.7 against an 80% AFUE furnace. Where electricity is cheap or gas is expensive, the break-even COP is lower and the heat pump can carry more of the season.
Upfront Cost and Total System Comparison
A gas furnace typically costs less to install as a standalone unit. But the relevant comparison isn’t furnace vs. heat pump. It’s furnace-plus-AC vs. heat pump, since a heat pump replaces both systems. When installation costs are evaluated on that basis, the gap narrows significantly.
Heat pump installations carry higher upfront costs than a furnace alone, but cover both heating and cooling from a single outdoor unit. Federal incentives have also changed. The Section 25C Energy Efficient Home Improvement Credit ended for equipment placed in service after December 31, 2025, and DOE guidance issued in 2026 narrowed what the HEEHRA rebate program covers. State and utility programs vary, so confirm current eligibility with the program administrator before factoring any incentive into a quote.
Long-term cost projections are sensitive to local utility rates and should not be used as a substitute for a site-specific analysis. Natural gas price volatility is a real factor. Clients in markets with cheap gas and expensive electricity will see a different outcome than clients in markets with low-rate electricity.
| Category | Heat Pump | Gas Furnace |
| Efficiency Metric | COP 2.5-4.0 (moderate temps); 1.5-2.0 (extreme cold) | AFUE 80%-98% (consistent across temps) |
| Heating Output | Warm supply air, 90-110°F | Hot supply air, 120-140°F |
| Cooling | Included (same system) | Requires separate AC unit |
| Backup Heat | Electric resistance strips (used in extreme cold or for quick warm-up) | None needed |
| Cold-Weather Floor | Varies by model; ENERGY STAR cold-climate units hold COP 1.75+ at 5°F | Full output to -40°F and below |
| Energy Source | Electricity | Natural gas or propane |
| Long-Term Cost Driver | Electricity price stability or volatility | Natural gas price stability or volatility |
Comfort Differences Contractors Should Know
Heat pumps deliver supply air at 90-110°F versus a gas furnace’s 120-140°F. In a well-insulated, properly sized installation, that difference is rarely noticeable. In a poorly insulated home with leaky ducts or an undersized system, a heat pump can feel like it’s running constantly without ever getting warm. Manual J sizing matters more with heat pumps than almost any other equipment decision. An oversized furnace covers a multitude of installation problems. An undersized heat pump exposes every one of them.
Dual-fuel systems add a layer of complexity at the thermostat. The system needs to be configured to switch between heat pump and gas furnace automatically at the balance point. Modern thermostats handle this well, but the configuration has to be correct. Wiring a dual-fuel system is different from wiring a standalone heat pump or furnace. An O/B terminal for the reversing valve, two separate heating stages, and balance point programming all have to be set properly.
A Practical Framework for Evaluating the Right System
When a client is deciding between a heat pump and a gas furnace, work through these steps before recommending equipment:
- Determine the climate zone. IECC Zones 1-3 favor heat pumps strongly. Zone 4 depends on local utility rates. Zones 5-6 require a cold-climate model or dual-fuel evaluation. Zone 7 warrants a dual-fuel or gas-primary analysis.
- Pull the client’s actual utility rates. The electric-to-gas price ratio at that specific address determines operating cost outcome better than any national average.
- Check whether natural gas service is already in place. If not, factor in the cost of a gas line extension when comparing systems.
- Evaluate the existing ductwork. Heat pumps move lower-temperature air at higher volume. Leaky or undersized ducts cause comfort problems. Recommend duct testing or sealing if needed.
- Run a Manual J load calculation. Never skip this step with a heat pump. Proper sizing is non-negotiable.
- Identify available incentives. Utility rebates and state programs can change the upfront cost comparison. Confirm current eligibility with the program administrator before including any incentive in a quote.
- For cold climates, evaluate dual-fuel. Pair a cold-climate heat pump with the existing gas furnace (or a new one) for the best year-round operating cost profile in Zones 5-6.
Frequently Asked Questions
What does COP mean, and how does it compare to AFUE?
COP (Coefficient of Performance) is the ratio of heat delivered to electricity consumed at a given moment. A COP of 3 means 3 units of heat out per unit of electricity in. AFUE measures annual gas utilization efficiency as a percentage. A 96% AFUE furnace converts 96% of gas burned into usable heat. Because heat pumps move heat rather than generate it, COP values above 1.0 are possible and typical. No furnace can do the same.
Do heat pumps work in very cold climates?
Cold-climate models do. Units that earn ENERGY STAR’s cold-climate designation must hold a COP of at least 1.75 at 5°F and deliver at least 70% of their 47°F heating capacity at 5°F. Low-temperature operating limits vary by model, so check the rated range for the specific unit. Standard (non-cold-climate) models lose efficiency and capacity faster as temperatures drop and may not maintain full capacity in extreme cold. For northern climates, specifying a cold-climate model or a dual-fuel setup is the right call.
What is HSPF2, and why did the rating change?
HSPF2 (Heating Seasonal Performance Factor 2) is the updated standard for measuring heat pump heating efficiency, effective January 2023. The new test procedure includes greater external static pressure to better represent real duct system resistance. A unit that rated 8.8 HSPF under the old standard rates approximately 7.5 HSPF2 under the new one. The federal minimum for split-system heat pumps is 7.5 HSPF2, and ENERGY STAR certification requires at least 7.8 HSPF2 for split systems.
What is a dual-fuel or hybrid heat pump system?
A dual-fuel system pairs an electric heat pump with a gas furnace backup. The heat pump runs during mild and moderately cold weather, where its COP is high and operating cost is low. When outdoor temperature falls below a configured balance point, set based on local electricity and gas prices, the system automatically switches to the gas furnace for cheaper or more reliable heat. It’s the strongest option for cold-climate installations where full electrification doesn’t make economic sense at current utility rates.
Why do heat pumps deliver cooler air than gas furnaces?
A heat pump delivers supply air at roughly 90-110°F. A gas furnace delivers 120-140°F. Both can heat a properly sized space to setpoint, but the heat pump takes longer to recover from a cold start and may feel like it’s running constantly in a leaky or undersized system. In tight, well-insulated homes, most occupants don’t notice the difference.
When does a gas furnace still make more sense?
A high-efficiency gas furnace often wins in Climate Zones 6-7 with inexpensive natural gas, when a client needs immediate replacement and budget is the primary constraint, and where electricity is expensive relative to natural gas.
What happens with backup electric heat strips on a heat pump?
Many heat pump air handlers are fitted with electric resistance heating strips for backup, used when the heat pump can’t meet demand or for rapid warm-up from cold start. Those strips typically draw 5-20 kW when running, depending on kit size. In moderate climates, they engage rarely. In northern climates during sustained extreme cold, they can run frequently and add real cost to the monthly bill. Cold-climate heat pump models minimize backup strip usage by maintaining higher COP at low outdoor temperatures.
Does eliminating gas service save money?
Potentially. Gas utilities typically charge a fixed monthly service fee that appears on the bill even when no gas is consumed. Eliminating gas service entirely removes that fixed charge. Clients who switch from gas heating to a heat pump but retain gas for cooking or water heating won’t capture this benefit unless they electrify all gas appliances.
How does the heat pump versus furnace comparison change if replacing oil or propane?
Oil and propane cost more per BTU than natural gas in most markets, so a heat pump usually compares more favorably against them than against natural gas. Actual operating costs depend on regional fuel and electricity rates, heating load, and the equipment installed.
Finding Your Comfort Zone
The heat pump vs. gas furnace question doesn’t have one right answer. It has one right process. Know the climate zone, get the actual utility rates, run the Manual J, and evaluate the full system cost including cooling. A 98% AFUE condensing furnace is genuinely efficient equipment. So is a cold-climate heat pump running at COP 3.0 in a Zone 4 installation. The equipment that wins on total cost of ownership over the next 15 years depends on numbers that are specific to the address, not the category.
In mild to moderate climates with reasonable electricity rates, heat pumps often win on operating cost and offer the added value of consolidated heating and cooling in a single system. In cold climates with cheap natural gas, dual-fuel configurations deliver the best of both: heat pump efficiency during the milder stretches of the heating season, gas reliability during the weeks when outdoor temperatures drop hard.
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