I used a Portable AC for over 15 years and I wanted to purchase a new window AC, so I decided on a Windmill Air AC and installed into my vinyl window and installation was as simple as it could be. I appreciate the phone App as it will tell you how much energy you are using in real time (updated every 10 seconds). My portable AC was using about 1145 watts on the highest level and the Windmill Air is using about 547 watts average on the highest level. My windmill Air takes up less space and works much better than my portable AC. I am quite satisfied with my Windmill Air purchase.