Foam "egg crates" (mattress pad) can be used to weatherize your swamp cooler. Remove the cover plate and stuff the egg crate into the empty hole. Be sure your swamp cooler is shut down (Water off, power off). Now replace the cover. Go out side and cover the outside of your swamp cooler with plastic and duck tape. You can even use those big black lawn and leaf bags, depending on the size of your swamp cooler, one may fit it perfectly. No more wintery blast from your cooler this winter.
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