Summary
We do not require, request, or store any personal information. The calculators on this site run entirely in your browser. We do not have user accounts, do not capture email addresses, and do not have a database storing visitor data.
Analytics
We use Google Analytics 4 to understand which calculators are most useful and where visitors come from. Google Analytics may use cookies and may collect anonymous information about your visit (pages viewed, time on page, approximate location, browser type). This data is aggregated and not personally identifiable.
Local storage
The site uses your browser's `localStorage` only to remember your light/dark theme preference. This information stays on your device and is not transmitted to any server.
Third-party links
Some pages link to third-party sites (data sources, partner services). When you follow a link, you become subject to the privacy policy of that site. We have no control over and assume no responsibility for the content or privacy practices of third-party sites.
Affiliate links
Some links on this site are affiliate links — clicking them and making a purchase or request may result in compensation to us. This does not affect what our calculators say or what assumptions they use.
Children
This site is intended for adults researching home energy decisions. We do not knowingly collect any information from children under 13.
Changes
We may update this policy from time to time. Material changes will be reflected in the 'last updated' date below.
Contact
For questions about this policy, contact us via the site.
Last updated: April 14, 2026