As I said in my earlier post, the heat pump feature was not something that I thought about for our main unit,or did I give the second unit a thought when we ordered our 5th. I think I did my homework in every other area before we ordered,but If I had thought a little more about the air and heat I would have ordered both. Since my second unit is an add on,it does not have the wall mounted thermostat,be nice if it did.