Contact

The most useful email we can get is “your number for my room is wrong, here is why.” Corrections to the method, a room type we have not covered, or a converter you wish existed are all welcome.

Email hello@freebtucalculator.com

If you are reporting a sizing result, please include:

• The page URL (the calculator link includes your inputs if you use the copy button)
• What you expected instead, and the source you are comparing against
• Anything unusual about the room: glass walls, vaulted ceiling, top floor, and so on

We read every message. We cannot recommend specific brands or give installation advice for your electrical or gas system; for that, talk to a licensed HVAC contractor or electrician.