Well, I'm just guessing, but having lived in Vermont all my life, I know a little about heating. :)<br><br>Probably a slab foundation that is run out under the driveway, which is paved, and poured deepenough to make a heat well. Lots of southern windows, triple pane, with shades for summer. Dark roof material and paint, maybe. And possibly in-floor heat- rather than heating the ceiling like most duct work, this goes under the floor and keeps your feet warm and the floor warm enough so that it doesn't conduct heat away, proably on a closed loop of water, so you aren't heating cold water. <br><br>And I'd wonder where the 60$ for heating is. In someplace like coastal North Carolina or Kansas, it's one thing. In Vermont, it's another.