I bought the LG14000 btu Inverter air conditioner because it's energy star rated & advertised to save 25% energy. I love it! It is so quiet, at times I think it's not on. I've been running it mostly on the economy mode, except for some real hot days. It cools our living room/dining area & kitchen & makes it so comfortable. I haven't got our first power bill yet, but I'm sure it'll be lower than from our previous unit! It's easy to use & has great features, such as wifi diagnosis withThin Q. The inverter function keeps it from cycling on & off so much, which I was told saves energy. This is my first LG appliance, but I am very pleased with my purchase!