I rated it one star because, even though it works well when it works, you should not buy something this expensive and heavy through Walmart online. They seem to have a deal with FedEx, and FedEx is the worst courier I've dealt with. They dropped this 75lb AC on its front edge and delayed delivery 4 times. The front of it was dented inward over half an inch. I managed to bend it back into place a bit, and it still worked, but it only lasted a few days before the fan motor died in it. Any time I've bought something through Walmart, it ships with FedEx and has some kind of delay or they have trouble with the address even though Amazon, UPS, and even DHL (the most infamous for losing things) manages to find the place with how screwed up it is on the maps. My address does show up both on Google Maps and FedEx's Forge Esri GIS Mapping System in the right place, so they should have no problem finding me, but half of them can't read, I guess.
Basically, this review is a warning to you, online shopper; don't ship things through Walmart. Try to find the same item on Amazon or eBay (it's usually cheaper, and that includes this exact AC). They both barely ever use FedEx (in fact, FedEx ended their contract with Amazon), so you'll likely get a better delivery experience AND a better price.