Presence of Installed Heat Source in Each Room
The heat source in a home is where the heated air enters the living space. This can be a floor or side vent with forced air heat, an electric baseboard heater, or a wall radiator with steam heat.
Part of the home inspector's job is to make sure that each room of the living space is habitable and comfortable for occupants year-round. This includes making sure that there is heated air available in all rooms. In addition to comfort, heat is necessary in the northern states to make sure that pipes don't burst in frigid weather, causing water damage.