# Freshness policy ## Two tiers **Volatile:** tax credits, rebates, refrigerant phasedown dates, and minimum efficiency standards. Re-verified every 90 days. Each carries a visible "Verified: date" stamp. **Stable:** physics, equipment types, troubleshooting, and definitions. ## Why this exists An out-of-date incentive page is worse than no page — it costs a reader real money. This area changed repeatedly between 2023 and 2026: the federal tax credits ended, and EPA revised the refrigerant installation deadline in May 2026. ## Automated enforcement The build fails if a volatile page is missing a visible verified-on date, and warns when that date exceeds 120 days. Both checks run in CI on every build. ## Who owns it The HVACBuddy Editorial Team owns the re-verification calendar. Every R3 claim, its source URL and its verification date are recorded in the repository's regulatory sourcing log. By [HVACBuddy Editorial Team](https://hvacbuddy.shop/authors/editorial-team/). Last reviewed: 2026-08-18.