A system for cooling portable facilities which include heat generating electronics, interior fans, a heat sink integrally serving as part of a wall or ceiling, and an outer heat pipe assembly in thermal communication with the heat sink allowing for heat dissipation. External fans pull external air over the outer heat pipe assembly. A first transducer monitors inner air temperature within the portable building, a second transducer monitors the outer heat pipe assembly, and a third transducer is secured proximate to a fin side of the heat sink. A controller is connected to the transducers, fans, and power supply. Computer instructions monitor temperatures from the transducers, compare the temperatures to preset limits, and individually or simultaneously actuate, regulate, or turn off the fans when monitored temperatures meet or exceed preset limits.