Title 24 Resources
Guides and articles about California energy code compliance
What Is a HERS Rater (Now Called an ECC Rater) and When Do You Need One?
Learn what a HERS Rater does, how the role is transitioning to ECC Rater under the 2025 energy code, and how to find one for your California project.
CF2R vs CF3R: What's the Difference?
Understanding the difference between CF2R installer certificates and CF3R verifier certificates for Title 24 compliance.
California Title 24 Compliance: A Builder's Complete Guide
A complete guide to navigating California's Title 24 energy code for new construction and major renovations.
What Does an Acceptance Tester Do? Title 24 Acceptance Testing Explained
Title 24 acceptance testing explained — what it covers, when it's required, and how to find a certified tester.
ECC Writer vs. HERS Rater: Which One Does Your Project Need?
Two different roles, both required on most California projects. Here's the difference between the ECC Writer (energy consultant) and the HERS Rater (field verifier).
Title 24 Solar PV Requirements for New Construction in California
California requires solar PV on most new construction and battery storage on certain building types. Learn what Title 24 mandates, what's exempt, and how a HERS Rater verifies your system.
What Is a CF1R? California Title 24 Compliance Report Explained
The CF1R is the foundation of every Title 24 project. Learn what it contains, who prepares it, and how it connects to the CF2R and CF3R.
Duct Leakage Testing in California: What to Expect
Duct leakage testing is one of the most common HERS requirements. Learn what it measures, when it's required, and how to prepare for a clean test.
Heat Pump Water Heater Requirements Under California Title 24
The 2022 standards effectively require heat pump water heaters for most new residential construction. Here's what you need to know.
HVAC Replacement and Title 24: When Do You Need a HERS Rater?
Replacing an HVAC system in California often triggers HERS verification. Learn when it applies and what tests are required.