Terms of use

Effective November 14, 2026. By using btuplanner.com you agree to these terms.

Estimates, not engineering

The calculators give planning estimates based on published tables and simplified formulas. They are not a heating or cooling load calculation under ACCA Manual J, a duct design under Manual D, an equipment selection under Manual S, or a code compliance check. Equipment, duct and insulation decisions for a real building should be confirmed by a qualified contractor and, where required, by your local building department.

No warranty

We work to keep every number correct and we fix errors we are told about, but the site is provided "as is", without warranties of any kind. To the extent the law allows, we are not liable for losses from using or relying on the results, including equipment purchases, energy costs or code violations.

Safety

Gas and combustion appliances, refrigerant work and electrical connections carry real hazards and are regulated. Nothing on this site is an instruction to do such work yourself.

Content use

You may link to any page and quote short passages with attribution. Do not copy the tables or calculators in bulk, or republish them as your own.

Changes

We may update these terms; the effective date above will change when we do. Questions: [email protected].