adding more heating runs
My son has a two story older home -- 3 bedrooms (only 1 has it's own heat vent, 1 doesn't have any, and the other shares a heat vent with a full bath). The lower level has a kitchen (2 heat vents), dining room (1 vent), living room (2 vents)bathroom (1 vent) and laundry/computer room (1 vent and also has the thermostat in it). The furnace runs for a very short time and then shuts off and never reachs the temperature that the thermostat is set at. How can he put in more runs upstairs without tearing apart walls. Is it even possible?