We have lived in our house for fourteen years but until we installed the Trane Heat Pump one and a half years ago we were not happy. This is the first time my house has been comfortable throughout. Before R2D2 as we affeciantly know it, our upstairs was hot in the summer and cold in the winter. No matter what I did I could not push enough air to the upstairs to make it comfortable. Now it is nice and cool in the summer and toasty in the winter. We push enough air to keep all of the rooms in our house comfortable plus our electric bill has been dramatically reduced because of the high efficiency of the heat pump. Another side benefit is that our gas bill has has been dramatically reduced because the furnace does not even kick in until it is below 20 degrees outside. I had originally projected an eight to ten year payback on this unit but I now think it will be closer to five or six years.