I had one simple question... We have a ranch home with 4 bedrooms and two baths. Master and bath are at one end, down hallway are two more and a bath. Another off the dining room with its own heat source.
My question is, is shutting the doors to the unused rooms, without shutting the vents, going to make more heat go to the rest of the house?
Depends....? It would depend on where your vents and returns are. If closing a door separates air flow from them or between them it'd have an effect - maybe warmer or maybe colder. Ideally each room was given a vent and a return. Does your hot heat come out at floor or upper ceiling too?
Mrdippy where do you live? In los angeles we have 1 return maybe 2. We always centrally locate them in a hallway. Since each room recieves a certain amount of heat, with the door closed it takes away from the total heat to the house. The heat will be trapped in the room. There will be a slight draft from under the door but the room will get hotter. Partly also cause the furnace will take longer to satisfy the thermostats call for heat.