California Title 24 Compliance Calculator
Evaluate your HVAC system's compliance with California Title 24 Part 6 energy efficiency standards. Enter your system specifications to determine if your equipment meets the minimum efficiency requirements.
Rated cooling output (1 ton = 12,000 BTU/hr)
Electrical power consumption at rated conditions
Seasonal Energy Efficiency Ratio from manufacturer specs (optional)
Heating Seasonal Performance Factor (heat pumps only)
Applicable Minimum Requirements:
Select system type and climate zone to view minimums.
Formulas Used
EER (Energy Efficiency Ratio):
EER = Qcool (BTU/hr) ÷ Winput (Watts)
SEER Estimation from EER (AHRI 210/240 approximation, when manufacturer SEER not provided):
SEER ≈ EER ÷ (0.875 + 0.025 × EER)
Adjusted Minimum Requirements:
Minadj = Minbase × Climate Zone Factor × Year Standard Factor
Annual Energy Consumption:
Eannual (kWh) = [Capacity (BTU/hr) × Annual Cooling Hours] ÷ (SEER × 1,000)
Assumptions & References
- Standard: California Energy Code, Title 24 Part 6 (2022 Edition), effective January 1, 2023
- Minimum SEER/EER values sourced from CEC-400-2021-020-CMF, Tables 110.2-A through 110.2-D
- Capacity tiers: Small <65,000 BTU/hr; Medium 65,000–135,000 BTU/hr; Large >135,000 BTU/hr
- Climate zone adjustment factors reflect CEC-recognized higher cooling demand in inland/desert zones (Zones 10, 13, 15 carry a +5–8% stringency factor)
- SEER estimation uses the AHRI 210/240 empirical relationship when manufacturer SEER is not provided; always use manufacturer-rated SEER for permit applications
- Annual cooling hours are CEC climate zone averages from the 2022 Reference Appendices (ACM Manual)
- Electricity cost assumed at $0.22/kWh (California residential average, EIA 2023)
- HSPF (Heating Seasonal Performance Factor) applies only to heat pump systems per AHRI 210/240
- This calculator is for preliminary screening only. Official compliance requires a CF1R/CF2R form submitted through the HERS Registry or approved compliance software (e.g., EnergyPro, CBECC-Res)
- Duct sealing, refrigerant charge verification, and airflow testing are additional Title 24 field verification requirements not covered here