stock-photo-15741579-pressure-gaugeChilled-water system, where the entire air conditioner is installed on the roof or behind the building. Its goal is to cool water between 40 and 45 degrees Fahrenheit. The chilled water is then piped throughout the building and connected to air handlers. This can be a versatile system where the water pipes work like the evaporator coils in a standard air conditioner. If it’s well-insulated, there’s no practical distance limitation to the length of a chilled-water pipe.