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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.
Since most retailers and manufacturers don't have specific estimates, consider using 7 to 9 gallons / 26 to 34 litres per hour as an average estimate, realizing your actual numbers will vary. Multiply average water use by the number of hours you plan to use your swamp cooler. Using it for the hot hours of 11 a.m. to 3 p.m. would mean 4 hours of use. 7 to 9 gallons / 26 to 34 litres per hour for 4 hours would be 28 to 36 gallons / 104 to 136 litres per day. Then simply multiply that number by what your water company charges per gallon / litre of water.