Ashful
Minister of Fire
Remember the earth surrounding the basement is about 57 Degrees ,much warmer then the winter air surrounding your next floor up.
True, but earth and concrete are much better conductors than air and insulated framed walls. This is why an un-insulated concrete basement wall will always be cooler than an insulated first-floor wall, given equal indoor room temperatures, even when the outside temperature is well below 57 degrees. Not saying it makes heating from the basement impossible, but it is a factor.