If you want to upgrade your commercial or industrial cooling, you should consider building a cooling tower. This type of heat-rejection system is economical because it releases heat through evaporation of water. Basically, the heat from the HVAC system and industrial machinery will be 'collected' by a cooling stream of water. The now heated water will then be cooled by air in the cooling tower. If you decide to set up this structure in your commercial property, it is important to understand the critical design factors.