Help with furnace please

My heat pumps will still put out pretty good heat all the way down to 32 outside and even then they are more efficient than restive heat. They do not stop working at 45, but your system may want to switch to your propane furnace at that temp. Several 1500W portable electric heaters can be used to warm things up if the heat pump cannot. If it gets below freezing outside then you need to use your furnace that hopefully heats the basement areas with water lines and tanks in them to keep them from freezing. Remove your water hose and use your 12V water pump/water tank when it's going to get below freezing too.

Welcome to RV.net, sorry about Usersmanual... you are not the first for his comments plus he thinks everyone should know as much as he does about everything.