Cogeneration systems linked to absorption chillers or adsorption chillers use waste heat for refrigeration. CHP systems linked to absorption chillers can use waste heat for refrigeration. Temperature is controlled through the use of submerged heaters, heat pumps, chillers, and heat exchangers. Cooling towers and pumps are used to supply cool condenser water to the chillers. Air-cooled and evaporative cooled chillers are intended for outdoor installation and operation. In industrial water chillers is the use of water cooling instead of air cooling. Moreover, the heat from the condensers of the chillers is recovered. Large chilled water hoses are used to connect between rental chillers and air conditioning systems. It also offers products for hot water generation including chillers with desuperheaters & heat pumps. In 2016, Trane was selected to provide replacement chillers for the tunnel's cooling network. Efficient absorption chillers nominally require water of at least . The company manufactured Kelvinator bunkers, dipping cabinets, blast chillers, reach-ins, and low- and medium-temperature merchandisers. TCBY also serves drinks such as Berriyo yogurt smoothies and Frappe Chillers. In extremely sunny climates, solar energy has been used to operate absorption chillers. This system is high maintenance and may be replaced by chillers in newer units.