EVAPORATIVE AIRCOOLERSPortable, temporary "swamp" coolers lower air temperature15° to 25°F.Recommended for stage events, hospitality tents and auto repair shops,sport ect anywhereBuilt-in water tanks for portable cooling or connect to a garden hose for all-day use.Durable, leakproof FRPhousing.Variable-speed fan. 120 Volts.Heavy-duty casters: 2 swivel, 2 locking.Low water level safety shut-off.ETL/C-ETL listed.36" Cooler- Cools up to 150square meterfor up to 12hours. 2evaporative pads included42" Cooler- Cools up to 200square meter for up to 12hours.2evaporative pads included.50" Cooler- Cools up to 350square meterfor up to 12 hours.3evaporative padsincluded.56" Cooler- Cools up to 450square feet for up to 12hours. 3evaporative pads included.