What is an Evaporative Cooler and How do Evaporative Coolers Work? How does a swamp cooler work? How does wet air cooler work? Do evaporative coolers work? How does desert cooler work?  An Evaporative cooler is based on evaporation system that cools air trough evaporation of water. The same evaporation system also works for swamp cooler, wet air cooler and desert cooler. It's more different from air conditioning systems. Air conditioner system use one of absorption refrigeration or vapor-compr...