Ask for insulation blankets, the Chinese initially started using external straw blankets that were rolled down over the greenhouse at night and rolled up during the day.
They have now switched to synthetic materials with electric motors that raise and lower the greenhouse blankets.
I recommend internal thermal blankets. I used shade cloth made out of polyester plastic suspended underneath the plastic face of my greenhouse to provide a hade in the summer and reduce heat loss in the winter.
Recently I’ve switched to a new material called Aluminet. It’s a UV protected polyethylene material that’s aluminized. It makes an excellent shade cloth in the summer and it radiates infrared radiation back into the greenhouse at night and cold winter days helping to maintain a constant temperature.
Joshua Myrvaagnes wrote:
Sometime when you have a few minutes, can any of you describe "pleasant temperature" a little more fully? would an elderly person with poor circulation feel comfortable? Are you staying bundled up much of the time? are there certain pockets of time when you're cold until you've gotten the fire going? Thanks!