Privacy policy
Effective November 14, 2026.
What you type stays in your browser
The calculators run entirely in your browser. Room sizes, temperatures, airflow values and anything else you enter are not sent to us or stored by us.
What our host records
The site is served by Cloudflare Pages. Like any web host, Cloudflare processes your IP address, browser type and the pages requested in order to deliver the site and block attacks. We do not receive a list of individual visitors. Cloudflare's own privacy policy covers that processing.
Cookies and analytics
We set no cookies and run no analytics or tracking scripts. If we add privacy-friendly analytics, or advertising that uses cookies, we will update this page first and, where the law requires it, ask for your consent.
If you email us, we use your address and message only to reply and, for error reports, to fix the calculator. We do not add you to a mailing list.
Children
The site is meant for adults planning work on a home. We do not knowingly collect information from children.
Contact
Privacy questions: [email protected].