How far away can your wood furnace be away from your central heat.My gas furnace is about twenty feet from nearest basement window. What I want to know is to get from the cold air return,and the input for the heat is this to far?I Think I can just buy a kit to take one of my little basement windows out and flu through it,which would be cheaper than tearing out my fireplace and adding a kozy heat zero clearance upstairs or would I be better off to go with the kozy heat.My new house is about 12-1300sqft.I think a wood furnace will give better even heat,and I can keep this all in the basement.