We recently purchased another thermostat and moved the furnace to it. This allows our heat pump to work at much lower temps and it does not switch to the furnace. We always had problems before with the heat pump running and then switching to the furnace. Now we can set the heat pump at whatever temp we want and it will run until it reaches that temp. This is one of the best mods we have made in the RV. We placed the new thermostat above the first one and the wiring was easy. Saves us lots of propane.