Our Products - Dunham Bush Known to provide one of the best water-cooled chillers in the market, Dunham-Bush continues to amaze customers around the world with its Water Cooled Chillers in the screw, centrifugal and scroll range that utilize environment-friendly refrigerants. Whether it is about keeping the room cool or warming up space, Dunham-Bush heat pumps are the equipment to cater for both these functions.