Title 24 Compliance for HVAC Contractors in California: What You Need to Know

California's Title 24 Building Energy Efficiency Standards are the most stringent residential energy codes in the United States. For HVAC contractors, Title 24 compliance is not optional and not simple — and getting it wrong means correction notices, failed inspections, and rework that erases project margin.

This guide covers what HVAC contractors in California need to know about Title 24 compliance in 2026, including what triggers compliance requirements, what documentation is needed, and where contractors most commonly get it wrong.

What triggers Title 24 HVAC compliance requirements

Not every HVAC project triggers a full Title 24 compliance analysis, but more projects do than contractors often expect:

• New HVAC installation in new construction: always requires Title 24 compliance
• HVAC replacement where duct work is also replaced or significantly modified: typically requires compliance
• Change in equipment type (e.g., switching from gas furnace to heat pump): requires compliance
• New duct system installation: requires compliance
• Like-for-like equipment replacement with no duct work changes: generally does not require full compliance, but check with the specific AHJ

The safest approach is to ask the building department directly whether your specific project requires a Title 24 compliance analysis before submitting the permit. A quick call saves a correction notice.

The Title 24 compliance documentation requirement

When Title 24 compliance is required, the permit submittal must include a Certificate of Compliance (CF1R) completed using California Energy Commission-approved software (CBECC-Res or equivalent). The CF1R shows that the proposed HVAC system meets California's energy efficiency requirements.

This documentation must be prepared before permit submittal — it's part of the plan check package, not something you submit separately after approval. Submitting without required Title 24 documentation is a guaranteed correction notice.

HERS verification: the field inspection requirement

Title 24 compliance for HVAC includes both a design component (the CF1R completed at permit stage) and a field verification component (HERS verification completed after installation). HERS verification is performed by a third-party California HERS Rater, not the building department inspector.

HERS verification is required for:

• Refrigerant charge verification on new split-system HVAC
• Duct leakage testing when duct work is altered or replaced
• Airflow verification in certain system configurations
• Fan watt draw testing in some cases

Heat pump permits and Title 24

The electrification push in California is driving significant growth in heat pump installations. Heat pump replacements (replacing gas furnace + AC with a heat pump) trigger Title 24 compliance requirements and also involve additional considerations:

• Electrical panel upgrade may be required if existing service is insufficient for heat pump load
• Separate electrical permit for panel upgrade if required
• Cold climate heat pump specification requirements for certain climate zones
• Utility interconnection documentation in some cases

Heat pump projects are among the most complex HVAC permits in California right now, and timelines are running longer than standard HVAC replacement in most jurisdictions as plan checkers get up to speed on the requirements.

Title 24 and permit timelines

Projects requiring Title 24 compliance review typically take longer to process than non-compliance HVAC permits. In most Southern California jurisdictions, add 30–50% to your standard HVAC permit timeline estimate for compliance projects.

Actively monitoring the permit status is more important, not less, for compliance projects — precisely because they're in review longer and corrections (when they occur) take longer to resolve.