Insulation for the Isolated

The conundrum of heating a 23'x32'x8' green house, cheaply.I happened upon a video, 5 years old now, from urbnfarmer on YouTube.
Guess its a little frustrating nowing that the video is 5 years old an he was speaking of this trick like it was centuries old, or that it took me a year an a half to find that 5 year old video.
Late Bloomer, or just terrible with the search bar.

Thanks for stopping in, have a great evening.

KnottyDaddy, Ties Off.