We have had this working for about 2 nights with the AC. So far, so good. It is slightly loud when it kicks in to high, but that's to be expected. Haven't used the heater yet, so not sure about that. The only thing keeping it from a 5-star, is that one of the window panels arrived cracked and there was not enough window stripping to fill the window space. We have an average size window, so that should not have been a problem. We were able to rig it to work and the cracked panel doesn't affect performance. It just shouldn't have arrived that way. Overall, satisfied so far!