California rule
The rules that come with it
Wall heater work permitted on or after January 1, 2026, is held to the 2025 Energy Code.
- Not every wall heater swap needs HERS testing; the work being done decides it.
- When it does, the homeowner picks the HERS rater if they wish.
Checked November 2026California Energy Commission, 2025 Building Energy Efficiency Standards
Checked November 2026California Energy Commission, Home Energy Rating System Program


