Today's homes require effective humidity control more than ever before. Equipped with super efficient central air-conditioning systems, near-impermeable vapor barriers and improved insulation, many new homes suffer from excess moisture problems. Air conditioning alone cannot satisfy your home's humidity requirements. Your air conditioning system is designed to control temperature - not humidity - and only removes humidity as a byproduct of cooling. During the spring and fall seasons when it's still cool outside but damp inside, your air conditioning isn't running and your house is uncomfortable - you need a whole-home dehumidifier.