Changelog

Recorded changes

2026-10-15: Version 0.2 release

• Heat-pump model v0.2: input validation added. Invalid or impossible values now produce a clear error rather than Infinity, NaN, or a silently omitted cost. Formulas are unchanged from v0.1.
• Default-data schema v2 records a value, unit, source URL, retrieval date, and verification status for each calculator default. Unknown sources and dates remain null; the current values are unverified.
• Solar panel cost calculator added with cautious, typical, and optimistic scenarios, a cumulative-position chart, and a year-by-year table.
• Educational article “How a heat pump works” added with cited US government publications.
• Trust pages, RSS, region selection, and updated calculator URL validation added; internal navigation and Open Graph images were corrected.

2026-10-15: Google Analytics integration

• The shared layout was configured to load Google Analytics with Measurement ID G-PGXZR145JR. This third-party processing is described in the Privacy policy. The current layout normalizes analytics page-location and referrer values to omit query strings and fragments.

2026-10-14: Version 0.1 baseline

• Initial site design system, shared layout, homepage, and US heat-pump calculator model v0.1.

Open items — not releases

• Source and verify the regional default datasets; all current calculator defaults remain marked unverified.
• Confirm the analytics property retention, data-sharing, advertising, and consent settings, and assess applicable consent requirements.
• Confirm the hosting provider request-log practices and obtain qualified legal review of the Privacy policy and Terms.
• Provide the site's legal operator identity if it is to be published; no entity or address is currently recorded in the project.

See the methodology, data sources, and Contact page for current details and reporting options.