Abstract: A roof mounted evaporative cooling system utilizing a plurality of elongate deflectors that are supported and secured a short distance above the ridge of a gable roof by a plurality of spaced apart support bracket connectors. Each support bracket connector has a central longitudinal portion with a hose barb at each end, and a vertical portion in which a spray nozzle is mounted. The support bracket connectors are joined together by a plurality of sections of flexible tubing having opposed ends engaged on the hose barb of the connectors and secured by hose clamps. Water is supplied to the connectors and adjoined sections of flexible tubing by conduit connected through a battery operated timer to an outdoor water faucet or to the cold water supply pipe in the attic of the building. In operation, the fine mist of water, under standard domestic water pressure impinges and spreads evenly along the underside of the deflectors and drips off of lateral side portions of the deflectors and runs onto the roof.