to cover or not to cover that is the question ?

I Used an Adco Tyvek cover for several years when we lived in western Washington. It held up pretty good. I used some PVC pipe laying on AC unit to form somewhat of a pitch to rain would run off better.
I cushioned the vent lids and ladder to protect sharp corners. Had to remove the radio antenna staff but not TV antenna. I would cushion the satellite antenna.
The cover lasted for many years.