Rooftop Systems (also known as Ruskin Rooftop Systems) manufactures commercial air-conditioning components for original equipment manufacturers, national account chain stores, and wholesale distributors throughout the world. The company, which was established in 1983, produces such accessories as residential and commercial energy recovery ventilation units, fresh air economizers, roof curbs and curb adapters, commercial diffusers, and hail and coil guards. Rooftop Systems is owned by UK-based manufacturing concern Tomkins, which acquired the firm in 2005.