Terms of Use

Last updated: 2026

Acceptance

By using this website you agree to these terms. If you do not agree, please do not use the tool.

The service

BTU Calculator provides heating and cooling capacity estimates for informational purposes only. Results are based on general rules of thumb and will not exactly match a professional load calculation (such as ACCA Manual J). For a purchase decision on expensive equipment, confirm sizing with a qualified HVAC professional.

No warranty

The tool is provided "as is," without warranty of any kind. We do not guarantee that the results are accurate, complete, or suitable for any particular purpose, and we are not liable for any decision made based on them.

Acceptable use

You may use the calculator for personal and commercial work. You may not attempt to disrupt the site, misuse it, or reproduce it as your own product.

Changes

We may update these terms from time to time. Continued use means you accept the current version.