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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.
Thread: Humming/whirring type noise from swamp cooler. Humming/whirring type noise from swamp cooler For the last few years, whenever the swamp cooler (roof mount) is turned on, whether it's in vent or cooling mode, it makes a very loud huming/whirring noise (kind of like an air raid siren that's very low pitched, or a vacuum in the other room).