If you can do a double layer, it really helps the insulation. Also the coldframe has a heat driven auto-opener (like this: https://tulria.com/wp-content/uploads/images/31RGOb9SHwS._SL500_.jpg), so it opens itself when it gets warm inside (in the morning), and closes itself when it cools off in the evening.
If you can do a double layer, it really helps the insulation. Also the coldframe has a heat driven auto-opener (like this: https://tulria.com/wp-content/uploads/images/31RGOb9SHwS._SL500_.jpg), so it opens itself when it gets warm inside (in the morning), and closes itself when it cools off in the evening.