Dunham Bush Manufacturing Company was built in USA in 1894. Dunham-Bush, one of the world's top commercial air-conditioning manufacturers , has long been committed to offering creative solutions for customers requirements throughout our 100+ year history in the heating, ventilation, air-conditioning and refrigeration HVACR. Dunham-Bush employs over 2,000 people in 15 regional sales offices and 4 factories worldwide (USA, UK, Malaysia, China).