It works very well, but during the day we set the temperture to 72 degrees starting at 6:00 AM until 10:00 PM. Then we wish it to just drop the tempature to 68 degrees from 10:00 PM until 6:00 AM. My problem is that when it gets close to 10:00 PM, the unit starts blowing cold air, cooling until it gets to 68. We want the unit just to stay off and let the temperture drop to the desired degrees.