A heat pump uses the outside air to heat your RV when it is cold and cool your RV when it is warm. Outside air is taken to a higher temperature than extracted by using a compressor. Despite this, heat pumps deliver less heat than an RV furnace at any one time so you will need to run a heat pump for longer than an RV furnace to achieve the same effect. Heat pumps are fully electrical and so are considered more environmentally friendly than some RV furnaces. However, if the outside air falls below freezing an RV furnace will function better since the heat pump will struggle to heat the freezing air. Additionally, an RV furnace will produce dryer air than that of a heat pump, therefore the RV furnace will feel hotter. Finally, a heat pump has more mechanical components than that of an RV furnace, meaning more components to be damaged by vibrations caused by travel in the RV.