This Trane runs hot and cold. The subsidiary of Ingersoll-Rand supplies heating, ventilation, and air conditioning systems to both the residential and commercial markets around the world. Trane specializes in designing massive commercial systems that heat and cool big buildings such as Beijing's World Trade Center and Toronto's Skydome. Its residential products are sold under the Trane and American Standard brands. Other products include chillers, air handlers and terminal devices, and thermostats. Trane also makes energy-efficient systems and filtered air systems that remove allergens and dust. The company sells its products through sales offices and dealers around the world.