What is a HERS Rater? (And When Do You Need One)
What is a HERS Rater?
A HERS (Home Energy Rating System) rater is a certified professional who inspects and tests a home's energy systems to verify compliance with California's Title 24 energy code. Think of a HERS rater as an energy code inspector â like a structural inspector checks framing, a HERS rater checks your HVAC systems, insulation, ductwork, and windows to make sure everything performs as the plans specify.
What Does a HERS Rater Actually Do?
During a HERS inspection, the rater performs a series of field tests and visual inspections. The most common measures requiring verification include duct leakage testing, airflow measurement, refrigerant charge verification, insulation inspection, and window verification. HERS raters use pressurization equipment to measure how much air leaks from your HVAC ductwork.
When Do You Need a HERS Rater in California?
You typically need a HERS rater for new residential construction, HVAC system replacements, home additions over a certain square footage, and major renovations with HVAC work.
HERS vs ECC: What's Changing in 2026?
Starting with the 2025 California Energy Code, the HERS program is being phased out and replaced by the ECC (Energy Code Compliance) program. The role is essentially the same, but the certification and provider structure is changing.