hvac mechanical contractorsCITY OF CHICAGO RECOMMENDED HVAC CONTRACTORS CITY OF CHICAGO ENERGY EFFICIENCY CODE HVAC FAQ FOR COMMERCIAL BUSINESS OWNERS HVAC FAQ FOR HOMEOWNERS HVAC FAQ FOR RESTAURANTS & HOSPITALITY BECOME A LICENSED HVAC (TGC) CONTRACTOR 2025 APPLICATION RULES Sign up with your email address to receive news and updates. Email Address Sign Up Thank you!