Amen!! And he is not the only one. I have been studying passive solar for many years and what was being done 40 years ago in homes is now being done in greeenhouses. Tubes are buried between 8 and 4 feet that store daytime heat and bring it up during the night when the greenhouses need heat. The greenhouses are insulated everywhere there is no sun coming in. And, there is some insulation even in the plastic being used to capture the sun. I posted the video to illustrate some of the principles being used. I will post a few more for those interested.