I have a two story home built in 2006, no basement. The furnace (gas-forced air) is on the second floor and the only cold air return is on the outside wall of the utility room where the furnace is (second floor). In the winter, the living room (main level) is very very cold and the upstairs (bedrooms and bathrooms) is warm. If we set the thermostat at 68 or above the furnace will run nonstop, heating the upstairs while downstairs remains cold. I only have three single vents in the ceiling to heat the main level. The question is, can I put a cold air return in the living room to help circulate the air and keep the warm air from being sucked up the stairs to the only cold air return? I can hit the existing cold air return box on the second floor by going through the ceiling in the living room. So, do I just add a grille to the living room ceiling and tie it into the return upstairs, or build a box/bump out from the living room wall with a grille at the bottom and tie that bump out into the return upstairs? And will either of these help the situation? Any help is greatly appreciated.