> this glass is so well insulated, it actually creates warmth in his living room: It admits the radiant heat of the low winter sun but prevents conductive heat loss through the window
In the summer without running the AC it would get up to 85-90F in there while only 70F outside… with the awnings we barely need the air conditioner most of the time. Still do on days when the outside air temperate is oppressive, but the place isn’t a greenhouse all summer!