A furnace generates heat by burning fuel (natural gas, oil, or propane) or using electric resistance. It creates heat and distributes it throughout your home via ductwork. A furnace only provides heating — you need a separate air conditioner for cooling.
A heat pump does not generate heat. Instead, it moves heat from one place to another using refrigerant and a compressor. In winter, it extracts heat from the outdoor air (even in cold temperatures) and pumps it inside. In summer, it reverses the process, acting as an air conditioner. This dual functionality means a heat pump replaces both a furnace and an AC unit.
Because heat pumps move heat rather than creating it, they can deliver 2-4 units of heat for every 1 unit of electricity consumed. This gives them an effective efficiency of 200-400%, compared to a furnace's maximum of 98.5%.
The initial cost of a heating system includes the equipment, installation labor, and any necessary modifications to your home's ductwork or electrical system.
| System Type | Equipment Cost | Installation Cost | Total Upfront Cost | After Tax Credit |
|---|---|---|---|---|
| Gas Furnace (80% AFUE) | $1,200-$2,000 | $1,500-$2,500 | $2,700-$4,500 | $2,700-$4,500 |
| Gas Furnace (95% AFUE) | $1,800-$3,000 | $1,800-$3,000 | $3,600-$6,000 | $3,420-$5,640* |
| Oil Furnace (85% AFUE) | $2,000-$3,500 | $2,000-$3,500 | $4,000-$7,000 | $4,000-$7,000 |
| Electric Furnace | $1,000-$1,500 | $1,500-$2,500 | $2,500-$4,000 | $2,500-$4,000 |
| Air Source Heat Pump | $2,500-$4,500 | $2,000-$4,000 | $4,500-$8,500 | $2,000-$5,550** |
| Cold-Climate Heat Pump | $3,500-$6,000 | $2,500-$4,500 | $6,000-$10,500 | $2,100-$6,350** |
| Geothermal Heat Pump | $8,000-$15,000 | $5,000-$12,000 | $13,000-$27,000 | $4,200-$11,700*** |
* 25C tax credit: 30% up to $600 for furnaces. ** 25C tax credit: 30% up to $2,000 for heat pumps. *** 25C tax credit: 30% with no cap for geothermal.
At first glance, furnaces appear cheaper. However, the comparison is not apples-to-apples. A furnace only provides heat — you still need to purchase and install a separate air conditioner ($3,500-$7,000). A heat pump provides both heating and cooling, so the total system cost comparison is:
| Combined Heating + Cooling System | Total Upfront Cost | After Tax Credits |
|---|---|---|
| Furnace (95% AFUE) + Central AC (SEER2 16) | $7,100-$13,000 | $6,280-$12,050 |
| Heat Pump (SEER2 18 / 10 HSPF2) | $4,500-$8,500 | $2,500-$6,500 |
| Cold-Climate Heat Pump (SEER2 20 / 11 HSPF2) | $6,000-$10,500 | $4,000-$8,500 |
When comparing complete heating and cooling systems, a heat pump is often cheaper upfront than a furnace plus AC combination — especially after federal tax credits.
Operating costs are where the heat pump advantage becomes clear. Because heat pumps are so efficient at moving heat, they cost significantly less to operate than furnaces in most scenarios.
| System | Climate Zone | Annual Heating Cost | Annual Cooling Cost | Total Annual HVAC |
|---|---|---|---|---|
| Gas Furnace (95%) + AC (SEER2 16) | Cold (Zone 6) | $1,200 | $120 | $1,320 |
| Heat Pump (SEER2 18/10 HSPF2) | Cold (Zone 6) | $1,050 | $100 | $1,150 |
| Cold-Climate Heat Pump | Cold (Zone 6) | $900 | $100 | $1,000 |
| Gas Furnace (95%) + AC (SEER2 16) | Mixed (Zone 4) | $850 | $250 | $1,100 |
| Heat Pump (SEER2 18/10 HSPF2) | Mixed (Zone 4) | $700 | $220 | $920 |
| Gas Furnace (95%) + AC (SEER2 16) | Warm (Zone 2) | $450 | $450 | $900 |
| Heat Pump (SEER2 18/10 HSPF2) | Warm (Zone 2) | $380 | $400 | $780 |
| Electric Furnace + AC | Mixed (Zone 4) | $2,200 | $250 | $2,450 |
| Heat Pump (SEER2 18/10 HSPF2) | Mixed (Zone 4) | $700 | $220 | $920 |
The most dramatic savings come from replacing an electric resistance furnace with a heat pump. Electric furnaces operate at 100% efficiency (1 unit of electricity = 1 unit of heat), while heat pumps operate at 250-400% efficiency. Switching from an electric furnace to a heat pump reduces heating costs by 60-75%.
Your local electricity rate and fuel prices significantly affect the operating cost comparison. Here is how heat pumps compare to gas furnaces in different scenarios:
| Location | Electricity Rate | Gas Rate | Gas Furnace Annual | Heat Pump Annual | Winner |
|---|---|---|---|---|---|
| Seattle, WA | $0.10/kWh | $1.20/therm | $850 | $580 | Heat Pump ($270 savings) |
| Dallas, TX | $0.13/kWh | $1.00/therm | $550 | $520 | Heat Pump ($30 savings) |
| Chicago, IL | $0.15/kWh | $1.20/therm | $1,050 | $950 | Heat Pump ($100 savings) |
| Boston, MA | $0.29/kWh | $1.50/therm | $1,300 | $1,850 | Gas Furnace ($550 savings) |
| San Diego, CA | $0.31/kWh | $1.60/therm | $650 | $890 | Gas Furnace ($240 savings) |
| Minneapolis, MN | $0.14/kWh | $1.20/therm | $1,200 | $1,050 | Heat Pump ($150 savings) |
| Atlanta, GA | $0.14/kWh | $1.30/therm | $750 | $620 | Heat Pump ($130 savings) |
In most U.S. locations, a heat pump has lower annual operating costs than a gas furnace. The exceptions are areas with very high electricity rates and moderate gas prices (California, New England). However, even in these areas, the gap narrows when considering that a heat pump also eliminates the need for a separate AC unit.
| Metric | Gas Furnace | Heat Pump | Explanation |
|---|---|---|---|
| Efficiency rating | 80-98.5% AFUE | 200-400% (COP 2-4) | Heat pump moves heat rather than creating it |
| Max theoretical efficiency | 100% (all fuel converted to heat) | ~600% (limited by thermodynamics) | Heat pumps extract free heat from outdoor air |
| Cold weather performance | Unaffected by temperature | Decreases below 25°F | Cold-climate heat pumps maintain 175%+ efficiency at -5°F |
| Cooling capability | None (requires separate AC) | Built-in (reverses to AC mode) | Heat pump replaces both furnace and AC |
| Dehumidification | None | Yes (during cooling mode) | Heat pump provides better humidity control |
To truly compare heat pumps and furnaces, we need to look at total cost of ownership over the system's lifespan, including upfront costs, operating costs, maintenance, and replacement.
| Cost Category | Gas Furnace + AC | Heat Pump | Difference |
|---|---|---|---|
| Upfront cost (after tax credits) | $6,280-$12,050 | $2,500-$6,500 | Heat pump saves $3,780-$5,550 |
| 15-year operating cost (mixed climate) | $16,500 | $13,800 | Heat pump saves $2,700 |
| 15-year maintenance cost | $2,250 ($150/year) | $2,250 ($150/year) | Equal |
| 15-year repair cost | $1,500-$3,000 | $1,200-$2,500 | Heat pump saves $300-$500 |
| Replacement cost (year 15) | $7,100-$13,000 | $4,500-$8,500 | Heat pump saves $2,600-$4,500 |
| 15-Year Total Cost | $33,630-$46,800 | $24,250-$33,550 | Heat pump saves $9,380-$13,250 |
Over a 15-year period, a heat pump saves $9,000-$13,000 compared to a gas furnace plus AC combination in a mixed climate. The savings come from lower upfront costs, lower operating costs, and lower replacement costs.
The most common concern about heat pumps is whether they work in cold climates. The answer is yes — modern cold-climate heat pumps are specifically designed for sub-zero temperatures.
| Outdoor Temperature | Standard Heat Pump COP | Cold-Climate Heat Pump COP | Efficiency vs Gas Furnace (95% AFUE) |
|---|---|---|---|
| 47°F (8°C) | 3.5-4.0 | 4.0-4.5 | 350-420% more efficient |
| 32°F (0°C) | 2.8-3.2 | 3.2-3.8 | 280-360% more efficient |
| 17°F (-8°C) | 2.0-2.4 | 2.5-3.0 | 200-280% more efficient |
| 5°F (-15°C) | 1.5-1.8 | 2.0-2.5 | 150-220% more efficient |
| -5°F (-20°C) | 1.2-1.5 (auxiliary heat) | 1.75-2.2 | 150-180% more efficient |
| -13°F (-25°C) | Auxiliary heat only | 1.5-1.8 | 130-170% more efficient |
Cold-climate heat pumps from manufacturers like Mitsubishi, Daikin, and Fujitsu maintain over 175% efficiency even at -5°F, meaning they still produce 1.75 units of heat per unit of electricity consumed at temperatures well below zero. They are rated to operate down to -13°F to -22°F without auxiliary heat.
| System | Annual CO2 (U.S. avg grid) | Annual CO2 (clean grid - WA) | Annual CO2 (dirty grid - WV) |
|---|---|---|---|
| Gas Furnace (95% AFUE) | 3,350 kg | 3,350 kg | 3,350 kg |
| Heat Pump (COP 2.8) | 1,640 kg | 420 kg | 2,600 kg |
| Oil Furnace (85% AFUE) | 5,100 kg | 5,100 kg | 5,100 kg |
| Electric Furnace | 4,680 kg | 1,200 kg | 7,440 kg |
On the U.S. average grid, a heat pump produces 51% less CO2 than a gas furnace and 68% less than an oil furnace. On a clean grid (Washington, Vermont), the reduction is 87-92%. As the grid continues to decarbonize, heat pump emissions will decrease further while furnace emissions remain constant.
Based on the cost analysis, here are general recommendations:
Disclaimer: The information provided on this page is for general informational purposes only and does not constitute financial, legal, or tax advice. Always consult with a qualified professional advisor before making financial decisions. Rates, thresholds, and regulations change frequently — verify current figures with official government sources.