attic ventilators. It also sells door chimes, medicine cabinets, trash compactors, ceiling fans, and central vacuum systems. Its Home Technology Products segment provides audio/video distribution and control equipment, including multi-room/multi-source amplifiers, home theater receivers, intercom systems, hard disk media servers, and control devices, such as keypads, remote controls, and volume controls; security and access control products comprising intrusion protection systems, and garage and gate operators, as well as devices to gain entry to buildings and gated properties. It also offers speakers and subwoofers, power conditioners and surge protectors, audio/video wall mounts and fixtures, lighting controls, and structured wiring products. The company's Residential Air Conditioning and Heating Products segment provides split-system air conditioners; heat pumps; air handlers; furnaces; and related equipment, accessories, and parts. Its Commercial Air Conditioning and Heating Products segment offers HVAC systems for commercial offices, manufacturing and educational facilities, hospitals, retail stores, clean rooms, and governmental buildings. Nortek serves professional remodeling and replacement, residential and commercial construction, manufactured housing, and the do-it-yourself markets. The company was founded in 1967 and is based in Providence, Rhode Island. Nortek, Inc. is a subsidiary of Nortek Holdings, Inc.