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Cole_Robbie · October 10, 2013

Here is a link to calculate heat loss from a structure:
http://www.builditsolar.com/Referenc...s/HeatLoss.htm

The r-value of 6-mil greenhouse plastic is .6

I'm getting ready to order a bender for EMT conduit for my first low tunnels, probably from lostcreek.net - I bought their top rail bender last year and built a high tunnel with it.

Both low and high tunnels are very poor at holding heat and will be close to the outside temperature by dawn. But they do protect from frost, and a killing frost can occur on a night as warm as about 40 degrees F. They are also obviously much warmer during the day, and provide wind protection as well.

October 10, 2013	#11
Cole_Robbie Tomatovillian™ Join Date: Jun 2012 Location: Illinois, zone 6 Posts: 8,407	Here is a link to calculate heat loss from a structure: http://www.builditsolar.com/Referenc...s/HeatLoss.htm The r-value of 6-mil greenhouse plastic is .6 I'm getting ready to order a bender for EMT conduit for my first low tunnels, probably from lostcreek.net - I bought their top rail bender last year and built a high tunnel with it. Both low and high tunnels are very poor at holding heat and will be close to the outside temperature by dawn. But they do protect from frost, and a killing frost can occur on a night as warm as about 40 degrees F. They are also obviously much warmer during the day, and provide wind protection as well.