Every calculator on HeatMath uses the same physics your installer uses: how much heat your home loses, how much energy each fuel contains, and how efficient the equipment is. Put in your own home and your local prices and you get numbers you can take to a contractor.
$ / yearHeat pump savings & paybackYour yearly heating bill with a heat pump versus gas, propane, oil or electric heat, and years to pay back.BTU / hrBTU calculatorHow many BTUs you need to cool or heat a room, and the AC size to buy.tonsHeat pump size calculatorRough heat pump size in tons for your whole house and climate.$ / MMBtuHeating fuel cost comparisonThe real cost of heat from gas, propane, oil, pellets, electric and heat pumps at your prices.kWh / yearSEER2 savings calculatorWhat a higher-efficiency air conditioner or heat pump saves on cooling each year.$ / monthSpace heater cost calculatorWhat it costs to run a space heater per hour, day and month.
Which calculator do I need?
- Thinking about replacing a furnace or boiler? Start with the heat pump savings calculator. It compares your current bill with a heat pump and gives a payback period.
- Buying a window or portable AC? The BTU calculator gives the size for one room.
- Getting quotes for a whole-house system? Check the tonnage with the heat pump size calculator before the installer arrives.
- Comparing fuels? The heating cost calculator puts gas, propane, oil, pellets, wood and electricity on the same scale.
All results are estimates. They are designed to help you ask better questions and spot a quote that looks wrong, not to replace an ACCA Manual J load calculation.