What is a swamp cooler? Also known as an evaporative cooler, this device—which is about the same size as a room air conditioner—lowers the temperature in a home simply by adding moisture to the air.

From small, portable models to powerful behemoths that can cool your entire house, here are the best evaporative coolers.

Add Yahoo as a preferred source to see more of our stories on Google. what is a swamp cooler and why is it better than an ac? Homeowners across the nation survived record heat at the end of June, the ...