Abstract: An environmental control system for maintaining a predetermined air temperature and relative humidity level of the interior of an enclosure, such as a wine cellar. A liquid chiller is provided which is adapted to cool liquid being circulated therethrough. An air handler has a cabinet with a heat exchanging unit and a blower disposed therein. The heat exchanging unit is operatively connected to the liquid chiller to receive cooled liquid being discharged therefrom. The blower is adapted to direct air from the enclosure over the heat exchanging unit such that the enclosure air is cooled. A liquid cascade unit has at least one surface with an upper and lower portion and a liquid collection pan attached to that lower portion. The upper portion is operatively connected to the heat exchanging unit such that liquid flows down from the upper portion toward the lower portion and into the liquid collection pan.