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Swamp Cooler Average Costs. 1  A whole house swamp cooler might cost $1,500 to $4,500 installed. 2  Two-stage evaporative coolers, which produce less in-home humidity by cooling the air before it passes through the moist pads, are quite a bit costlier than the one-stage coolers described above.
When you have 80% relative humidity in the morning the amount of moisture added by the swamp cooler is negligible. As the heat of the day arrives and the relative humidity falls, more moisture evaporates at the swamp cooler (subsequently lowing the air temperature). Again, 70F 80% relative humidity is comfortable. 95F 36% relative humidity is not (and they contain the same volume of water vapor).