Washington HVAC Load Calculation
Professional HVAC load calculation requirements for Washington. Get accurate heating and cooling load calculations with state-specific design temperatures, building codes, and local climate considerations for Seattle, Spokane, Tacoma and 3 more cities.
Quick Start Washington Load Calculator
Get started with your Washington HVAC load calculation using our professional tools designed for local climate conditions.
Washington Design Temperatures
Winter Design Temperature
Used for heating load calculations and equipment sizing across Washington
Summer Design Temperature
Used for cooling load calculations and equipment sizing across Washington
Climate Zone Information
Washington spans climate zones 4C and 5B, which means different regions may have varying design requirements. Always verify local design temperatures for your specific project location.
Washington Building Codes & Requirements
HVAC Requirements
- • Very high efficiency standards
- • Duct testing mandatory
- • Advanced ventilation
Note: One of the most stringent energy codes in the nation
Energy Code
2018 Washington State Energy Code
Common Building Types
- • Traditional homes
- • Green buildings
- • High-tech facilities
Washington HVAC Challenges
Marine climate
Seismic requirements
Green building standards
Energy codes
Major Cities in Washington
Quick Facts
Local Resources
Washington State Department of Commerce
government
Washington HVAC Association
organization