Dallas Hermetic Co

24 Hour, Ltd. is an industry leader in the design, installation, repair and maintenance of heating, ventilation, air-conditioning and refrigeration systems. The company features full HVAC engineering capabilities, design-build services, installation, thermography reading, duct cleaning, and vibration and sound analysis. It provides expertise in building automation and energy management. 24 Hour, Ltd. also performs onsite balancing of rotating equipment. The company provides recommendations to customers for energy savings. It maintains complete HVAC fabrication facilities equipped to handle galvanized sheet metal, steel, copper and aluminum. 24 Hour, Ltd. is a part of 24 Hour, Inc. The company is headquartered in Dallas.

Founded in 1976, Poly-America is one of the largest recyclers and compounders of polythene in the world. Based in Grand Prairie, Texas, the company produces a number of polythene product lines. Poly-America offers a range of products, which include trash bags, sheeting, speciality film and geomembrane. The company is a part of a group of privately-held corporations, including Poly-Flex Inc., Poly-Flex Construction Inc. and Poly Trucking Inc. Poly-America is an active member of Operation CleanSweep.