We looked into geothermal, but it was hideously expensive. Now that could be because we're in MA, I don't know. We hope to move back South, so that's where all this will take place, someday.
I'll have to look on the HGTV website to see if they have a link to the roofing you saw.
I believe the show is called "I Want That". It looked exactly like a wood shingle.