I bought this air conditioner because I had a window unit that I had to take out in winter and put back in summer. But when it arrived and I installed it, it made an unbearable noise, and at night I couldn't sleep. If I turned off the heat, I couldn't sleep, and if I turned it on, the noise wouldn't let me. I wrote to Vevor, and they told me to disassemble it as if I were a technician. I wrote to PayPal, and we reached an agreement; they refunded me $160 to pay a technician, and that's what I did. They charged me $175, but now I can sleep happily. I'm content.