Denning, Inc.

Denning, Inc. is a family-owned and operated HVAC contractor serving the Chicagoland area for over 40 years. As a signatory contractor with Sheet Metal Workers Local Union #265, the company employs skilled union tradespeople committed to quality and safety. The company's core services include HVAC installation, maintenance, and repair for commercial and industrial clients. Denning, Inc. specializes in serving the healthcare, manufacturing, and education sectors, bringing expertise in custom sheet metal fabrication, energy-efficient system design, and project management. Head-quartered in Wasco, IL, Denning, Inc. serves clients throughout Illinois and the surrounding Midwest region. Their geographic reach allows them to support projects ranging from local renovations to multi-state industrial facility upgrades. The company maintains strong relationships with the Sheet Metal Workers union and is committed to employing trained, certified tradespeople. Denning, Inc. holds HVAC contractor licenses in multiple states and has a proven safety record, with certifications in OSHA safety protocols. With a team of over 50 professionals, Denning, Inc. has the resources to handle projects of all sizes, from small tenant improvements to large-scale manufacturing plant overhauls. The company's reputation for reliability, quality workmanship, and competitive pricing has earned them numerous repeat clients and industry accolades over their 40+ years in business. For HVAC services in the Chicagoland area, contact Denning, Inc. to discuss your next commercial or industrial project.