I ordered a Windmill Whispertech AC and it was super loud. I was walked through a very comprehensive troubleshooting process and it did not fix the issue. They overnighted me a new AC unit at no additional cost. The new unit is amazing. It is so quiet - incomparable to regular window units. It also does a great job of cooling down my house. I live in a small Cape Cod and this one AC cools the entire first floor (with the help of some ceiling fans!).