Let me start by saying this cover set is a game-changer for those of us who leave window AC units in year-round. The double protection (indoor + outdoor covers) actually works - I noticed significantly less cold air sneaking into my apartment compared to my old DIY blanket-and-duct-tape solution.

The outdoor cover's 600D Oxford cloth with PVC coating is no joke. After three snowstorms, it's still completely dry inside. Meanwhile, the indoor cover's aluminum film layer does help retain heat better than I expected - my thermostat shows about 2°F warmer than last winter.

Installation is mostly straightforward, but here's the catch: the elastic straps are disappointingly flimsy. On windy days, I had to reinforce them with extra bungee cords. Also, the sizing can be tricky - my AC unit is pretty standard, yet I still needed to fold excess material.

Biggest pain point? The drawstring design struggles with power cord placement. My unit's cord exits at the bottom left corner, creating a gap that defeats the insulation purpose until I modified it with scissors (not ideal).

For $20 though? Worth it if you manage expectations. Just don't expect miracles from those straps, and maybe keep your measuring tape handy before ordering.