our house is 2 story, with the downstairs being a poured wall basement. it is completely finished and has its own hvac system. our staircase leading downstairs (basement) has no doorway to close the top from the bottom. I have the best fireplace ever. It will run you out of the house if you aren't careful, but no matter what we do we can't push the heat downstairs. i can run ceiling fans up stairs and down but it just doesn't heat the downstairs. we keep the upstairs in the mid to low 70's but the downstairs can get in the low 60's without running the downstairs hvac. it isn't an issue for us since we don't use the downstairs much. the wife has an exercise room down there, a sitting room we never use, and then my room that will one day be my gun room. spray foam insulation sure helps everything, except humidity,haha.

Scott Hanners