Evaporative Cooler - Home Cooling Costs - 7 Simple Money-Saving Strategies - Bob Vila
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Bring On Evaporation
Evaporative coolers are making a comeback of sorts, particularly in dry climates, where these simple machines can lower the air temperature by five degrees or more (by blowing air through wetted pads). No, evaporative coolers are no substitute for air conditioning on a sweltering day, but they are cheaper to operate when the heat is not extreme.