There was a thread in this forum a few months ago about building a house that sort of had a house within a house. Part of the idea was that there would be a "solarium" - a south facing sun room. And that would have air connections to a basement. and there would be an air route over the house and down the back too. I tried to search and google, but I wasn't coming up with the right words. Can anybody give me some keywords or point me to the thread?