Disclaimer: Actual costs will vary depending on weather conditions and usage. This information is intended for comparison purposes only. This calculator should not be used to determine the purchase, size or SEER/AFUE rating of a new HVAC unit, it is intended for cost comparison purposes only. Our data comes from Energy Star, the Department of Energy (DOE), the US Energy Information Administration (EIA) and the National Oceanic and Atmospheric Administration (NOAA).