So far so good. Installation is as easy as they say. The look is better than I know of any window ac unit - a big thanks for that. Most importantly, it cools great! I do have central AC (live in Louisiana), but use Windmill to offset the heat when cooking in the kitchen. Lately, I leave it on at night and it lessons the strain on the central unit. I give 4 stars because I cannot yet speak of longevity. That fifth star will be if it last a few years.