The pads chill and filter the air and the blower passes the resulting cool breeze through your home. Evaporative coolers cost quite a bit less than air conditioning. However, cost isn't the only advantage of eevaps. Unlike most air conditioning systems that recirculate air, they bring lots of fresh clean air into the home, upping indoor air quality. Central Air Good as they are, evaporative coolers can't match the carefully controlled cooling power and dehumidification offered by a compressor-drive air conditioner.
Air conditioning cools two ways.
First, it removes heat from the air, thereby lowering its temperature. Second it removes water vapor from the air. A good central air system will also control air circulation and provide a means to filter the air. Flexible ductwork is an economical way to retrofit an old house with air conditioning. Central air conditioners use a compressor, two coils and a chemical refrigerant to extract heat from the indoor air and transfer it outside.