Heat Pump vs Gas Furnace: Annual Heating Cost Calculator

Modern cold-climate heat pumps (rated for -13°F/-25°C) work effectively even at sub-zero temperatures. Brands like Mitsubishi Hyper Heat, Bosch, and Daikin offer models that deliver 100% rated capacity down to 5°F (-15°C). A backup electric resistance element or dual-fuel gas backup handles the few days per year below design temperature.

Coefficient of Performance (COP) measures how many units of heat a heat pump delivers per unit of electricity consumed. A COP of 3.0 means the heat pump delivers 3 kWh of heat for every 1 kWh of electricity — 300% efficient. Gas furnaces can never exceed 100% AFUE because combustion physics limits them.

Annual Fuel Utilization Efficiency (AFUE) is the percentage of fuel energy converted to usable heat over a heating season. A 96% AFUE furnace converts 96 cents of every dollar of gas into heat; 4 cents escapes up the flue. Federal minimum is 80% AFUE; high-efficiency models run 95–98%.

A dual-fuel system pairs an electric heat pump with a gas furnace backup. The heat pump handles the majority of the heating season efficiently, and the gas furnace kicks in only on the coldest days when the heat pump's COP drops below the point where gas becomes cheaper. It's a popular option in cold northern climates.

Payback period depends on climate, local utility rates, and installation cost difference. In mild climates with high gas prices (California, Pacific Northwest), payback can be as short as 4–6 years. In cold climates with cheap gas (Midwest), payback runs 8–12 years. The $2,000 IRA 25C tax credit substantially shortens payback.

Replacing a gas furnace with a heat pump typically takes 1–2 days for a straightforward swap. If the project requires adding an air handler, running new electrical service (240V circuit), or replacing ductwork, allow 2–4 days. Most HVAC contractors can schedule installation within a few weeks.

Not necessarily. Many homeowners cap the gas valve at the furnace and leave the line intact. This preserves flexibility to add a dual-fuel backup or gas appliances later, and avoids the cost of full line removal. If your utility charges a monthly gas meter fee, disconnecting the meter saves $10–$30/month.

Heat pumps typically last 15–20 years with proper maintenance; gas furnaces often last 20–25 years. Both benefit from annual professional servicing. Because a heat pump handles both heating and cooling, you may be replacing two appliances (furnace + AC) with one unit, which simplifies your equipment footprint.