Return air vents : I have an old 3 storey house. I live on the 1st floor over the basement.?
There are 4 apartments on the 2 floors above. We replaced the old boiler hot water heat in the basement with a gas forced air furnace and ran ductwork to the 1st floor rooms. Almost half of my apartment is over crawl space. The installer never put in returns to pull the cold air out from my apartment so it always feels cold at the floor level. He set up the return right at the furnace with a filter so it draws on air from the basement to warm & send up to my apartment. I wonder if I can cut 2 openings in the floor in 2 rooms over the basement area, put in a floor vent . I am thinking that the heavier cold air will go into the basement and that will take away some of that cold feeling at the floor level ?
We also put in a second unit on the second floor hallway that supplies warm air to the 4 apartments on the 2 floors upstairs. Again no way or connecting returns to pull out the cold air at floor level. Could I cut an opening at a low point on the front doors of each of the 4 apartments, put in a grill and that will let the cold air come into the hallway where it can get sucked into the furnace intake.
Do let me know if gravity will work in my favor by these simple changes I can do myself. I am hoping that the priciple of hot air rising & cold air sinking will work in my favor & I can get some benefit by letting this cold air have somewhere to go instead of just sitting there.