Air-cooling models from Diversified Air Systems combine the features of traditional central air conditioning systems into one compact unit. The Strategic Air Center functions both as a spot cooler as well as a portable air conditioner since it has a thermostatic expansion valve which adjusts the freon flow to suit the ambient conditions. Its sophisticated microprocessor control system and advanced constant pressure allows the unit to maintain a temperature set point with pinpoint accuracy for critical environments such as computer rooms and other electronic equipment.