A self-contained system uses the return trough as the holding tank. Any water that is not evaporated is collected in the holding tank underneath the pad and recycled back through the system, back up to the top of the pads. While the water is flowing through the pad, air is pulled or exhausted through the wet pad with a series of large exhaust fans or shutters on the opposite side of the building. Water is then forced through small holes along the length of the supply pipe and deflected off the top cover where it flows down and through the pad. A sump pump is used to pump water to the top of the pad through a supply pipe. ![]() With a combination system of evaporative cooling pads and exhaust fans, the pads are installed along the side or back wall of your house with exhaust fans located on the opposite wall. With a properly designed system, the air inside your greenhouse can be up to 20 degrees cooler than the air outside. Evaporative cooling causes that chill you feel when you get out of a swimming pool. Both options use the method of evaporative cooling, which uses the heat in the air to remove and absorb water. ![]() Two popular options for additional greenhouse cooling are a combination pad-and-fan system or high-pressure fogging system. Shading and natural or mechanical ventilation will cool your greenhouse to an extent, but you will likely need to add an additional cooling source during the peak hours of summer.
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