Basement is in ground and my furnace (aire-flo 80 eff) is also in basement. I have forced air in the basement and on the main level. I also have a gas fireplace (with no fan) on the main level. Baseboard heating upstairs.
I’ll set my thermostat to 20 and it will feel great in the basement and main floor. But upstairs it is about 4 degrees different (crude test but my baseboard thermostat clicked on around 16 degrees). When walking upstairs to top floor you can almost feel cold air rushing down the stairwell.
Solution: the only things that I can think of are a ceiling fan upstairs to pull air up. Install a fan in fireplace to push air up the stairwell.
Thank you for reading this and am looking forward to seeing your responses