In terms of your home’s climate control system, you may use gas for your furnace in the winter. However, many homes in the Tucson area have heat pumps. These only run on electricity. In fact, they do not actually generate heat at all. Instead, they work by extracting warmer air from the outside and transferring it to the indoors during the winter. In the summer, this process is reversed. Warm air is removed from the inside of the home and expelled to the outdoors.