Today's question is from J. Sutton. "Does the MrCool Advantage heat by electric or propane?" The MrCool Advantage heat pump uses electricity to heat. In case you don't know, a heat pump is like an air conditioner. It takes heat out of your house and throws it outside. That's how it keeps your house cooler. When it goes to heat, it runs in reverse by taking the heat from the outside and bringing it inside. That's how it makes your house warmer. So, it uses electricity for the process. It doesn't do it like an electric furnace, though. That is just like a toaster heating, except bigger. That's the most inefficient way to heat your home. Heat pumps are way more efficient that a regular electric furnace. MrCool Advantage heat pumps also don't use propane. I'm not familiar with any mini splits that use propane or natural gas or coal or any fossil fuels. The closest thing you could get would be like a wall heater. Some of them use natural gas. Those are not mini splits. They are more like PTAC furnaces. Have more questions? Just ask them in the comments below or on Facebook or on Twitter.