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Cole_Robbie · November 20, 2016

Here is a useful link:
http://www.builditsolar.com/Referenc...s/HeatLoss.htm

The R value for 6 mil plastic is .6 and an inflated double layer is about R1.6 I think. Using the calculator will make it sink in how difficult it is to heat a greenhouse. The best design I have seen is Chinese. It's only clear on the south side, and they roll a big insulated blanket down every night and back up every morning. For my greenhouse, I have to build a little low tunnel around the plants, drape that in plastic, and put the heater under there.

November 20, 2016	#14
Cole_Robbie Tomatovillian™ Join Date: Jun 2012 Location: Illinois, zone 6 Posts: 8,407	Here is a useful link: http://www.builditsolar.com/Referenc...s/HeatLoss.htm The R value for 6 mil plastic is .6 and an inflated double layer is about R1.6 I think. Using the calculator will make it sink in how difficult it is to heat a greenhouse. The best design I have seen is Chinese. It's only clear on the south side, and they roll a big insulated blanket down every night and back up every morning. For my greenhouse, I have to build a little low tunnel around the plants, drape that in plastic, and put the heater under there.