First of all, mounting was a pain. Our windows don't slide up/down but sideways. In fact, the all homes in our area are that way. It took some thought and time to mount the unit. The unit works fine except I can't tell the difference in the fan speeds. We use it to keep our garage cooler in 100 plus degrees. It gets the temperature down to a low of 84 degrees even when the A/C is set at 68 degrees. I thought it would get it a little cooler.