[djmcmath]

Tankless water heating, in my book, is "green" in the sense that it saves me money on my monthly energy bill. That is only true, of course, because I'm using less energy. If tankless is the way to go, I'll certainly do that.

I hadn't realized geothermal was such a good idea. The down side, of course, is that it's pretty expensive to drill a deep enough well to get consistently 55 degree water, isn't it? How long do you have to save on your electric bill before the system pays for itself?

ErVikingo, I admire your investment in the environment. I can't imagine how expensive all of that must be ... but I'm curious -- what does a solar panel big enough to supply the AC cost? I definitely like the fiber optic sunroof idea -- that's just brilliant.

How would a garage heat ventilation system work? Maybe running it just like the house vent system -- a big fan blowing into the attic space, draw the heat from the hot car into the attic and out the far side? Set it up on a timer, so you push a button and it runs for X minutes -- experimentally determined to remove most of the heat without wasting any additional energy?

Dan