I am building a residential model in Trace 700 where I use an air to air heat source pump for my cooling equipment. I have an electric resistance heating system to be used with my heat source pump. how can i make sure that my heat source pump is being used for heating? Do I need to set the backup heat source for the cooling equipment as my heating equipment? I would also like to model a similar air to air heat put that uses propane instead of electric for heat. There is probably a simple answer for this, but I can't seem to see anything in the output that would say otherwise. Any help would be greatly appreciated