About HVAC Calculators

HVAC Calculators helps homeowners and DIYers estimate cooling BTU, heating load, and mini-split head size before buying ductless equipment. Enter space dimensions, pick your application type — RV, tiny home, shed, cottage, or standard room — and get a sizing summary you can copy to your notes or contractor.

The calculator runs entirely in your browser — no account, no uploads, no sales calls. Results are planning estimates, not a substitute for licensed Manual J load calculations or permit work.

Questions or feedback? Get in touch or email [email protected].