Illinois HVAC Load Calculation Guide
Free HVAC load calculation guide for Illinois. Review climate zones, design temperatures, building code context, and local calculator resources for Chicago, Aurora, Rockfordand 2 more cities.
Start with the Free Illinois Load Calculator
Use our residential or commercial calculator to estimate loads with Illinois-relevant climate conditions in mind.
Illinois Design Temperatures
Winter Design Temperature
-8°F
Used for heating load calculations and equipment sizing across Illinois
Summer Design Temperature
91°F
Used for cooling load calculations and equipment sizing across Illinois
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
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Cold winters
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High humidity summers
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Urban heat islands
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Lake effect weather