So I am going to add a 45,000 BTU pellet stove in my unfinished basement to heat it and 1st floor above. House is 1930's solid masonry 1 1/2 story 25' x 40' basement and 1st floor. Nearly all new windows throughout and I have studded out walls that were just solid brick on first floor with rigid foam board which has helped retain heat to some degree. Currently have wood insert at one end but 40' at other end kitchen is cold. Plan on putting pellet stove near bottom of stairway in kitchen which goes to basement. Figure heat will rise into kitchen but that I probably would need to put cold air return somewhere on first floor, yes? Currently have no return ducts/registers anywhere. If this sounds right should first floor return be at opposite end of basement stairway or close to where pellet stove will be in basement? does it matter? Please help me!