Click here to go to the calculator. It’s an online Excel file. To input your house, you’ll have to save your own copy first.
Correction 3/23/22: The formula for the small house HVAC system is now corrected, and several fields in that area are now unlocked for editing.
Please contact Aide below with any comments or questions about this cost calculator. This will go straight to my inbox, but helps manage spam. Thank you!