Abstract: A method and device are disclosed for eliminating condensation on condensate drainage piping located in a warm attic-type atmosphere caused by cold condensate water emanating from the indoor section, including an air handler, of an air-conditioning system comprising an external shell; first and second connections from the external shell; flow restricting apparatus within the external shell operative to impede the flow of the cold condensate water; and a reservoir formed from the cold condensate water which has been warmed and deposited within the external shell, the reservoir being further heated by the warm attic-type atmosphere; and emptying the excess reservoir water into the condensate drainage piping at a temperature whereby the condensate drainage piping will be free from condensation.