Best outdoor swamp cooler for up to 3,000 sq. ft.: Hessaire 11,000 CFM 3-speed portable evaporative cooler Pro Tip : The latest swamp coolers require dry air to function.

Through May 5, the Costway 3-in-1 Evaporative Air Conditioner Cooler is on sale for just $95.99, down from its regular price of $299. That's a discount of 68%, or $203.01 off.