It worked on the same premise as a heat pump.
When I moved into my cabin, I had to get rid of all the dark wood in the place. Everything was dark brown, including the plaid wallpaper on the walls. I knew that the cabin was mostly used by men, but even they deserve some color other than browns. I started changing all the dark browns for something as color, and then I looked at the old stove in the corner. I knew that it had to go. There was smoke smudges on the wall behind it and there was ash burns on the floor. I had to get rid of that stove. I couldn’t believe the difference in how the room looked when that stove was gone, but now I needed to find a source of heating for the cabin. I called the local HVAC company to see if I could have central heating and air conditioning installed into the cabin. When the HvAC technician arrived, he did a thorough inspection of the cabin. He told me there wasn’t enough space for ductwork, so traditional central heating and air conditioning was not able to be installed. He suggested I go with a ductless HVAC. It worked on the same premise as a heat pump. There would be small units at the top of the walls and one outside, opposite the inside unit. I would have heating and air conditioning from the same unit. There was little servicing needed, but once a year he suggested a HVAC technician come out and flush the system. The ductless HVAC system sounded perfect for my cabin.