Privacy policy

Last updated September 20, 2026.

Calculator inputs stay in your browser and are not sent to our server. HVAC Cost Check does not require an account or email address to use its tools.

Calculator data

The published calculators run in your browser. The project details you enter are used to update the displayed estimate and are not submitted to an HVAC Cost Check account or lead form. Avoid entering personal information into any free-text field that may be added to a future tool.

Analytics and advertising

HVAC Cost Check uses Google Analytics to measure site traffic and understand how visitors use the calculators. Google Analytics may collect site interactions, approximate location, and browser or device information. It may also set a first-party cookie such as _ga to distinguish visitors and sessions. Google explains how it handles this information in its Privacy Policy.

HVAC Cost Check includes Google AdSense code and may display advertising. Third-party vendors, including Google, use cookies to serve ads based on a visitor's prior visits to this site or other websites. Google's advertising cookies allow Google and its partners to personalize those ads.

You can opt out of personalized Google advertising through Google Ads Settings. You can also block or delete cookies through your browser settings. Google provides a Google Analytics opt-out browser add-on.

External links

The site links to government agencies, standards organizations, manufacturers, publishers, and GitHub. Those services have their own privacy practices. Following an external link may allow that service to receive information such as your IP address, browser details, and the referring page.

Public correction requests

Correction requests are handled through public GitHub issues. Information posted there is visible to other people and is governed by GitHub's policies. Do not include a home address, contractor proposal, equipment serial number, account information, or other private data.

Policy changes

This page will be updated when the site's data practices materially change. The date above identifies the latest published revision.

Contact

For a public site or policy correction, open an issue in the project repository. Do not include personal or sensitive information in a public issue.