Martin Burns enthused about underfloor heating: >>Underfloor heating is good because it doesn't need to be as hot >>as radiators. Plus, your feet are more heat-sensitive (and need >>to be warmer for *you* to feel warm) than your head. So a gentle >>heat to the feet is a much more energy efficient way of heating >>than convecting radiators that just put a pool of hot air above >>your head. Hi Martin, I hadn't seen the light pipes before. But I really like the idea a lot. ;-) I also like the idea that, although I have not been able to see prices yet, they *look* like they should be reasonably priced (including install) and may actually have a financial payback. I also think light pipes may be a wonderful alternative in my neighborhood where skylights can actually be a BAD idea because they let in sooooo much heat they can cost you money in A/C bills. That darn ole sun. Too mucho caliente! I've seen the underfloor and underground heating application things. But that was years ago. I believe there were some commercial trials in the Northern US under airport runways to try to alleviate some of the problems with ice in the winter. I have also heard of some home applications in the Northern US for driveways, sidewalks, and interior floors, but (IIRC) those were _very_ expensive. [The Public Television Show 'This Old House' put some in a $$$$$$$ home in Massachusetts a while back, for example.] I have not been actively following the 'green building technology' scene. It's a very very neat idea, but are these underfloor heating boogers actually an affordable option for the average person yet? Curious RonL.