HeatingCodesFree heating tools
All three tools run in your browser. Nothing you enter is sent to us.
Decoder
Fault code decoder
Type a code, flash count or symptom and see every verified match, with the manufacturer document it came from and the models it covers.
CalculatorHeating cost calculator
Compare what the same heat costs with natural gas, propane, heating oil, electric resistance or a heat pump using published EIA prices for your state.
CalculatorRepair vs replace calculator
Apply ENERGY STAR age guidance and the Department of Energy's 50% repair-cost rule to your own repair quote.