You could say it is using some natural heat.
If you are terrible at making decisions, you’re entirely struggling to get through life! I feel as if my friend and I as humans are consistently making decisions in our heads, and you are consistently deciding what to do or when to do it, then some decisions are much larger than others. Some decisions matter more than others, and my husband plus I just made a very immense decision for our home… We needed to replace our furnace, however the reason this is a very immense decision is because it will be in our home for a very long time. There will be no need to replace it in the near future. What my friend and I choice is what my friend and I are stuck with. We made sure to do a lot of research into what system my friend and I wanted. We looked at a gas furnace, an electric furnace plus a heat pump. We really decided that a heat pump would be very efficient, then a heat pump uses the warmth that is already found within the air. The heat pump just adds heat. A furnace is consistently turning on plus off to keep the home as a consistent temperature that you desire. The heat pump is along the same idea. It does not work as taxing though since it already uses the warmth that the air offers. You could say it is using some natural heat. It also pumps out the cool air within your home. That is where some of the warm air comes from. It was confusing to us at first, however my friend and I are blissful with our decision, then do your research before you make a immense decision like this.