We weighed investing in a ductless system vs the windmill and ultimately decided for our needs, the windmill ac unit was perfect. We purchased the 8k btu with the whisper tech feature since this is for our second floor and is placed in our master bedroom. Our central AC just does not really work for the second floor. This unit Iexceeds our expectations. It was super easy to install, it’s very quiet and efficiently cools not just our second floor but, as a bonus, also our first floor. We have our central air set at 80 degrees and the downstairs temp reads anywhere from 70-75, depending on time of day and outside temp. The upstairs is super comfortable and while we have the windmill unit set at 75 (on eco), it consistently reads lower. To be fair, we have a brick house and great insulation. My husband says this is the sleekest window unit he’s ever seen and he’s right! It looks good on both sides. We definitely do not regret our decision to just get the windmill vs the ductless system.