Free Gas Furnace Cost Calculator

Furnace Running Cost Calculator

Estimate how much a natural gas furnace costs to run per hour, day, month and heating season using heating output, furnace AFUE, runtime, gas price and blower electricity use.

Calculate Furnace Running Cost

Gas Furnace Operating Cost

Estimate your monthly heating expense.

To compare gas heating with cooling and other HVAC energy use, try the HVAC monthly energy cost calculator . If you are considering electric heating instead, use our heat pump running cost calculator .

Calculate Gas Furnace Running Cost

Enter your approximate heating load, furnace efficiency, runtime and utility rates.

Approximate Heating Output Use approximate delivered heating output, not automatically the furnace input rating.

Furnace AFUE (%) Enter the furnace efficiency rating if known.

Average Furnace Runtime Per Day

Natural Gas Rate ($ / Therm) Replace the example rate with your actual gas price.

Furnace Blower Power Used to estimate the electricity consumed while heating.

Electricity Rate ($ / kWh)

Average Heating Load

Estimated Heating Days Per Year

Estimated Monthly Furnace Running Cost - -

This estimate includes natural gas consumption plus approximate furnace blower electricity. Actual heating costs vary with weather, thermostat settings, equipment cycling, duct losses, home construction and utility pricing.

- Estimated Monthly Therms

Cost Per Hour -

Cost Per Day -

Monthly Gas Cost -

Blower Electricity -

Furnace operating cost higher than expected?

Request HVAC help below if you want to provide your location and information about the heating system.

Calculator note: one therm represents approximately 100,000 BTU of fuel energy. AFUE is used here to estimate the fuel input required to provide the selected useful heating output. The calculation is for planning and is not a fuel-meter measurement or guaranteed utility cost.