Abstract: A condensate vapor and liquid vent for use with an operable air conditioning system in a habitable structure or enclosure which is substantially closed to the atmosphere. Ambient damp air under positive pressure is forced past a conventional refrigerated "A" frame evaporator of reduced temperature. The dampness and contaminants from the air are condensed, concentrated and collected in a pan which surrounds the lower portion of the "A" frame evaporator. A portion of the upper surface of the collection pan is enclosed except for a small opening around the "A" frame condenser and between the "A" frame evaporator and the upper surface of the collection pan. The collection pan has an inclined bottom surface to allow all of the condensate liquid to flow to one corner where a liquid drain removes condensate to the structure sewage system. Intermediate the corner of the collection pan and the conventional "P" trap of the condensate drain system is a vapor vent to atmosphere.