About Us

Denning Inc is a family owned and operated HVAC company located in Wasco IL. We have been here since 1980 and have provided top quality work to thousands of satisfied customers in the Chicagoland area for 40 years. Our company specializes in Commercial and Industrial jobs.

We are proud members of Sheet Metal Workers Local Union #265
Why choose Union Sheet Metal Workers?
Union sheet metal workers are true craftsmen. Each craftsman is required to have been fully trained in a 5 year apprenticeship program. A wide variety of tasks must be perfected to complete the apprenticeship program. The apprenticeship program ensures your project is getting a skilled professional and true craftsman, worthy of the respect the Sheet Metal Industry has proudly earned.