Last updated: April 2026
The short version
- Calculator inputs stay in your browser.We don't send your ZIP code, square footage, or energy data to a server.
- No accounts, no signups, no email harvesting.
- No selling data, ever.We aren't a lead-gen site.
- Privacy-respecting analytics for aggregate page views — no individual tracking, no third-party advertising IDs.
What we collect
Calculator inputs. Everything you type into a calculator (ZIP code, square footage, occupants, insulation level, etc.) is processed entirely in your browser. Nothing is sent to Calculate HVAC Load servers. The PDF report is generated locally; the email results button opens your own mail client.
Server logs.Like every web server, our hosting provider records IP address, user agent, and request URL for each page view. These logs are used to debug errors and prevent abuse. They're kept for 30 days and never linked to identity.
Analytics.We may use a privacy-respecting analytics tool to count aggregate page views (e.g., "1,200 visits to the BTU calculator last week"). We don't use Google Analytics, Facebook Pixel, or any cross-site advertising tracker. No cookies are set for advertising purposes.
Theme preference.When you toggle dark mode, we save the choice in your browser's localStorage so your preference sticks across visits. This stays on your device.
What we don't collect
- Your name, email address, or phone number (no signup exists)
- Calculator inputs or results (everything stays in your browser)
- Geolocation beyond the ZIP code you optionally type
- Cross-site tracking IDs or advertising fingerprints
- Device sensors (camera, microphone, accelerometer)
Cookies
We use no cookies for tracking, advertising, or personalization. Browser localStorage is used only for the dark-mode preference. If we ever add a feature that needs a session cookie (e.g., saving your project list across visits), this policy will be updated and the cookie will be opt-in.
Third-party services
The site is statically hosted (no application server) and uses no third-party APIs at runtime. The contact form opens your local mail client via a mailto: link — your message goes through your own email account, not through us.
Children's privacy
The site is not directed at children under 13. We don't knowingly collect any personal information from children. If you believe a child has provided information, contact us and we'll delete it.
Your rights
Because we don't collect personal data, there's nothing to access, port, correct, or delete. If you live in the EU, UK, California, or another jurisdiction with privacy laws (GDPR, CCPA, etc.) and you have a data-rights request, contact us — we'll respond within the legally required timeframe.
Changes
We'll update this page when our practices change. The "Last updated" date at the top reflects the most recent revision.
Contact
Questions about privacy? Reach out.