Founded in 1978 as Ductmate Industries, DMI Companies, Inc. is a manufacturer of HVAC products and building automation systems serving contractors and builders worldwide. Its four manufacturing divisions produce union-made products, and the company is known for engineered duct systems and components. DMI operates manufacturing facilities in several states and also offers Airoverse building automation for commercial buildings.
TRUE Gold Certification
TRUE Certification
ENERGY STAR Certification
SMACNA Class 3 Seal
Mestek Commercial Damper and Louver Group (MCDLG)From its Wyalusing, Pennsylvania base, Mestek Commercial Damper and Louver Group brings together several HVAC brands to manufacture air-control and ventilation products for construction projects. With more than 50 years in the HVAC industry, MCDLG makes its products in the United States and supports the field through AMCA-certified offerings, UL Life Safety products, and continuing-education courses. It is a division of Mestek Inc.WYALUSING, PA
1HVACFounded in Ohio in 1938 as an HVAC manufacturer’s representative, 1HVAC now supplies residential and commercial systems while manufacturing sheet-metal air-distribution products. Its unusual combination of representation and in-house production gives contractors a single source for equipment, ductwork, fans, and related boiler components. The company serves the Dayton-area market and sells across Ohio, while also operating affiliated HVAC businesses in other regions.TROY, OH
Hranec CorpFounded by Steve Hranec in 1995, Uniontown-based Hranec Corp. combines mechanical construction services with large-scale HVAC manufacturing, including custom ductwork and roof products. Its manufacturing operation has expanded from a 2008 fabrication facility to a 40,000-square-foot roof-product shop and a 200,000-square-foot building completed in 2026. Hranec also stands apart with specialized offerings such as outdoor Tuff Duct and its patented Spiral Graphix, which turns exposed spiral ductwork into customized visual displays.UNIONTOWN, PA
DiversiTech CorporationSince its founding in 1971, DiversiTech Corporation has grown from an equipment-pad maker into a large HVAC/R manufacturing company serving wholesalers, contractors and technicians. Known for its equipment pads, the company now operates more than 1 million square feet of manufacturing and distribution space across North America and Europe, while supporting customers through a broad single-source supply model.GLENWILLOW, OH