California HVAC Load Calculation Guide
Free HVAC load calculation guide for California. Review climate zones, design temperatures, building code context, and local calculator resources for Los Angeles, San Diego, San Joseand 3 more cities.
By HVAC Load Calculate Team — Licensed HVAC professionals
Need HVAC installation in California?
Compare contractors, costs, and code requirements statewide.
Start with the Free California Load Calculator
Use our residential or commercial calculator to estimate loads with California-relevant climate conditions in mind.
California Design Temperatures
Winter Design Temperature
Used for heating load calculations and equipment sizing across California
Summer Design Temperature
Used for cooling load calculations and equipment sizing across California
California Building Codes & Requirements
HVAC Requirements
- • HERS verification required
- • High-efficiency equipment mandatory
- • Demand response capability
Note: Most stringent energy codes in the US with frequent updates
Energy Code
Title 24 (most stringent in nation)
Common Building Types
- • Stucco/frame homes
- • Multi-family housing
- • Commercial high-rise
California HVAC Challenges
Seismic requirements
Wildfire concerns
Diverse climate zones
Strict efficiency standards