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KarenO · October 31, 2017

my greenhouse in zone 3 had twin wall construction. Another person knew had single wall polycarbonate. My greenhouse was easy to regulate the temp in, His was freezing. As you state, I think 3 things would be important : plants up off the ground, the ground was easily degrees colder than the temp in the middle of the greenhouse. If you have a thermometer in there, put it at the level where your plants are, second layer of insulation either cover the plants or if feasible, a second layer of poly over the whole hoop house but I think that would be hard to secure. might be better to line the interior so the wind doesn;t play havoc.
Even a small heater easily kept my greenhouse well above zero with temps of -10 outdoors. The friend with single wall could not heat his effectively at all.
how about rolls of wide clear bubble wrap to line the inside of the hoop house. That would add some significant R value. but the light would still be good.
KarenO

October 31, 2017	#59
KarenO Tomatovillian™ Join Date: Oct 2012 Location: Vancouver Island Posts: 5,922	my greenhouse in zone 3 had twin wall construction. Another person knew had single wall polycarbonate. My greenhouse was easy to regulate the temp in, His was freezing. As you state, I think 3 things would be important : plants up off the ground, the ground was easily degrees colder than the temp in the middle of the greenhouse. If you have a thermometer in there, put it at the level where your plants are, second layer of insulation either cover the plants or if feasible, a second layer of poly over the whole hoop house but I think that would be hard to secure. might be better to line the interior so the wind doesn;t play havoc. Even a small heater easily kept my greenhouse well above zero with temps of -10 outdoors. The friend with single wall could not heat his effectively at all. how about rolls of wide clear bubble wrap to line the inside of the hoop house. That would add some significant R value. but the light would still be good. KarenO Last edited by KarenO; October 31, 2017 at 01:06 PM.