Cool Prep areas to Patios: The stifling heat of summer can make outdoor patio areas off limits, but Port-A-Cool® units can reduce temperature by an average of 15 to 25 degrees F. Operates on tap water and 115v of electricity All units are mobile for easy spot cooling. The new filler cart unit operates for up to 8 hours without a hose connection. 36 inch High Performance unit features quiet operation and cools about 2,650 sq. ft.