Skip the guesswork and the sales pitch. Enter your square footage, climate, and insulation, and get a BTU range with the math shown. No sign-up, no email.
Single-purpose tools that answer one question well. Each one shows its formula and sources, so you can check the work.
Right-size heating by square footage, climate, and insulation.
Tonnage and BTU for cooling, by climate, sun, and occupancy.
A fuller Manual-J-lite estimate with ceiling height and windows.
What an insulation upgrade saves per year, and when it pays back.
Daily, monthly, and yearly run cost for any appliance.
Watts for the circuits you actually want to back up.
This is a fast estimate to get you in the right range before you call a contractor. It is not a substitute for a full Manual-J load calculation on a sizing-critical install.