If there is no circulation, place an air diffuser under or attach to the chiller coil. Single stage controller maintains temperature within 1° differential. The unit is made of black ABS plastic cover and a remote digital electronic controller which displays temperature, set point in either °F (±1°) or °C, mounted in a NEMA enclosure. All chilled water coil systems will be factory set to operate most efficiently at your specified cooling temperature. You must specify at time of order. Designed for indoor use with unrestricted air flow only. Uses ozone friendly 134A refrigerant. 2 year warranty standard, 5 year warranty available upon request.