Most people think that air conditioners lower the temperature in their homes by pumping cool air in. The actual process removes warm air from your house and cycles it back in as cooler air. As this happens, it removes the moisture from the air (dehumidification) making you feel cooler and keeping molds and other harmful organisms in check. This cycle continues until your thermostat reaches the desired pre-set temperature. If your air conditioner is too powerful, it will cool your air without dehumidifying it. Your thermostat will reach the correct temperature, but you won’t feel as cool while molds and other harmful organisms thrive. If your air conditioner is too weak, it will stay on constantly, driving your bills through the roof.