I live in Birmingham, Alabama & I have wanted to own a heat pump so badly, however a heat pump is a two for one system, however you get one device that can deliver heating & cooling, however how it does is by moving existing heat energy, and the heat pumps from outside to inside in the winter; It utilizes the ground temperature that is officially warmer. Here is the snag though. If your winter temps get lower than 40 degrees, the air is simply not warm enough. You can’t heat your house. In Birmingham, Alabama, there are three months out of the year that get nights in the 30s. That would be awful! I debated on using space heaters for supplemental heating however the boost on my electric bill would be too much; So then my fantastic friend and I talked to my local Birmingham, Alabama Heating & A/C dealer. Tech guy proposed a hybrid heating system or also known as a dual fuel system. This combines a heat pump & gas heating system to work for the AL weather, but for most of the year my heat pump is the one that is working. I have ideal air conditioner & most of the time unbelievable heat. Then when the nights get cold, the device swings to gas & the heating system operates. I never suffer from a chilly winter night. I don’t get as efficient of results however that is the best I can hope for with my chilly weather. I like that I don’t even have to push a button or toggle a switch for the device to change heaters.