How Heat Pumps Work Differently
A furnace burns fuel (gas, oil, propane) or uses electric resistance to generate heat. A heat pump doesn't generate heat — it moves it. In winter, a heat pump extracts heat from outdoor air (even cold air contains heat energy) and moves it inside. In summer, it reverses direction and moves heat from inside to outside (like a central AC).
This is why heat pumps are so efficient: moving heat requires far less energy than generating it. A heat pump can deliver 2-3 BTUs of heat for every BTU of electricity consumed, giving it an effective efficiency of 200-300%. Even a 96% AFUE gas furnace only converts 96 cents of every dollar of gas to heat.
Climate Suitability
- Mild to moderate climates (Zones 1-4): Heat pumps excel here. If your average January low stays above 20-25°F, a standard heat pump provides efficient, comfortable heating without any supplemental system needed.
- Cold climates (Zones 5-7): Traditional heat pumps lose efficiency as temperatures drop below 30-35°F. Cold-climate heat pumps maintain efficiency to -13°F or lower. For very cold regions, a dual-fuel system (heat pump + gas backup) provides efficient heating at moderate temperatures and reliable backup at extreme cold.
- Very cold climates (Zone 7+): High-efficiency gas or propane furnaces remain the most practical primary heating option in areas with sustained extreme cold and extended heating seasons.
Cost Comparison
Upfront Costs
- Heat pump system: $3,500-7,500 installed (replaces both AC and furnace)
- Gas furnace + AC: $4,000-10,000+ installed for both systems
Operating Costs
Heat pump vs. furnace operating costs depend on local electricity and natural gas prices. Generally: in areas with electricity under $0.12/kWh and moderate winters, heat pumps are less expensive to operate. In areas with expensive electricity or very cold winters, gas furnaces may have lower operating costs. Run the math for your local utility rates before deciding.
When Each Makes More Sense
- Choose a heat pump when: You live in a mild to moderate climate; you want one system for both heating and cooling; your home has no gas service; you want the lowest carbon footprint; federal or state incentives are available (the IRA offers up to $2,000 in heat pump tax credits)
- Choose a gas furnace when: You live in a very cold climate with sustained below-zero temperatures; your existing ductwork is optimized for higher-temperature gas heating; gas is significantly cheaper than electricity in your area; you want maximum heating output during extreme cold
Frequently Asked Questions
Are heat pumps effective in cold climates?
Modern cold-climate heat pumps work to -13°F or lower. For very cold climates, a dual-fuel system (heat pump + gas backup) provides the best efficiency across all temperatures.
Is a heat pump cheaper to run than a gas furnace?
It depends on local electricity and gas rates. In areas with moderate electricity costs and mild winters, heat pumps typically cost less. In very cold climates with expensive electricity, gas may be cheaper.
Does a heat pump replace both the AC and furnace?
Yes. A heat pump handles both heating and cooling, replacing two separate systems with one.
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HeatingCoolingSource is an informational resource. System selection depends on your specific home, climate zone, and local utility rates. Consult a licensed HVAC contractor for recommendations specific to your situation. Tax credit eligibility requirements may change; consult a tax professional.