Remember the oil emargo and then the tax credits given by the Carter administration? Hell, I was a local chapter member of the Solar Energy Society. We were doing infiltration testing, jamming every possible crack with foam, blowing insulation eveywhere, installing steel siding, double and triple pane windows, 2x6 exterior walls with interior barriers, heat pumps, solar, log and earth contact homes were all the rage.

A great deal of awareness and research occured then which developed quite a head of steam then oops...administration change, no more tax credit... back to incredibly inefficient western framing.(must be political)