Illinois HVAC Load Calculation
Professional HVAC load calculation requirements for Illinois. Get accurate heating and cooling load calculations with state-specific design temperatures, building codes, and local climate considerations for Chicago, Aurora, Rockford and 2 more cities.
Quick Start Illinois Load Calculator
Get started with your Illinois HVAC load calculation using our professional tools designed for local climate conditions.
Illinois Design Temperatures
Winter Design Temperature
Used for heating load calculations and equipment sizing across Illinois
Summer Design Temperature
Used for cooling load calculations and equipment sizing across Illinois
Climate Zone Information
Illinois spans climate zones 4A and 5A, which means different regions may have varying design requirements. Always verify local design temperatures for your specific project location.
Illinois Building Codes & Requirements
HVAC Requirements
- • High-efficiency equipment
- • Duct testing mandatory
- • Ventilation requirements
Note: Chicago has additional green building requirements
Energy Code
2018 IECC with Illinois amendments
Common Building Types
- • Urban apartments
- • Suburban homes
- • Commercial high-rise
Illinois HVAC Challenges
Cold winters
High humidity summers
Urban heat islands
Lake effect weather