These evaporative coolers utilize highly efficient housing that is designed to produce effective cooling in highly humid conditions. Portable evaporative coolers help increase worker productivity by creating a more comfortable working environment. Swamp coolers feature one-piece molded polyethylene housing with an internal one-piece, leak-resistant molded plastic water tank. Water is supplied to internal tank using a standard 3/4" hose (not included). These evaporative air coolers have an energy efficient motor and pump.