What are Dehumidifiers used for? An air conditioning system controls temperature, but is not designed to control humidity. Some humidity may be removed during the cooling process, but during spring and fall, when your air conditioner isn’t running, the air in your home can feel damp and uncomfortable. An Aprilaire Whole Home Dehumidifier, installed as part of your home’s heating and cooling system, efficiently balances the humidity levels in your home for ultimate comfort.