I do because Action Furnace gave me a free cover hahaha.This quote is hidden because you are ignoring this member. Show Quote
I haven't noticed issues with condensation buildup when taking the cover off for the following season. I also haven't seen any rodent issues but I do check often to ensure there are no rodents using the area for cover.
I have friends that use covers and others that do nothing but also friends who toss a piece of plywood overtop and set a brick/rock on top to keep the plywood on.
Really, it's more personal preference to be honest. If I didn't get the cover for free I'd more than likely do nothing to be honest re: covering the AC unit.