Well, that's my bias too. See this in case you haven't:
http://ecorenovator.org/forum/solar-...bottom-up.html
It seems like the roof heating is going to end up working fantastic for where I live. I was just starting to think that I better warn people here about the pitfalls if they don't live in an area conducive to a roof heating system. I'm only getting about 35F temp rises under the very best conditions. That works fine for here but I doubt that would work most places in the Midwest, Northwest and East, as well as almost all of Canada. And that still leaves out places like where I grew up where there just isn't the potential to get a maximum of 35F temp rise in the heart of winter. I just don't want to end up being a destructive force by influencing people to get into what I'm doing only because it works for me where I happen to live. I often wish other people here that are very knowledgable would use this principle also.