When my central Heating & A/C system up & quit on me I did some research, i wanted both heating & cooling. I wanted something powerful, energy efficient & that would last a long time. In my research I found a heat pump, however you get both heating & cooling in one single unit. It moves heat energy so it is incredibly efficient, then since it is ductless it can be used for zone control. I was so excited to have this system. I called my local Glenview Heating & A/C supplier immediately to get my heat pump installation, but the Heating & A/C worker informed me that they don’t sell heat pumps! Also, I didn’t genuinely want a heat pump in my home! He then explained that the heat pump needs existing heat in the air in order to function in the winter. If the temperatures drop below cold, the heat pump is worthless. I was seriously bummed to hear that Illinois gets too cold in the winter time that I couldn’t have a heat pump. The Heating & A/C worker did point me in the right direction though. He told me to look at dual fuel systems. This combines a heat pump & a gas furnace. So when the Glenview winters get severely cold, the gas heater will operate… When it gets a little warmer, the heat pump is tagged in. It fluctuations from gas to electric based. I then would have the energy smart heat pump as my AC device. I now just need to find a Heating & A/C supplier that will install dual fuel systems.