This is a specific AC for specific purposes. I say this because it is expensive. It is the quietest AC that goes in a window I have ever experienced. In addition to it being quiet on low fan speed, it has dual inverter compressor tech which prevents that constant ac compressor start up sound. I honestly don’t know when the compressor comes on and goes off. I use it for a 300sqft room and it works great. So far so good. I am giving it four stars because it is pretty expensive.