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**eskimosik** · 10-22-2011, 01:46 PM

What attempts are you making to store heat? Do you have large (sealed) barrels of water in the green house under the benches to hold heat? The problem with a big empty green house is that air doesn't hold warmth very well. Unless you fill the g/h with something with a high heat capacity (i.e. which can hold heat) the g/h very quickly bleeds heat. Also, if you haven't properly double-glazed the root and sides then the heat escapes all the faster. If you are using glass then the problem is all the worse as glass is an excellent conductor of heat. You want to be using polycarbonate or something similar with at least a 1 inch gap between the two sheets.

10-22-2011, 01:46 PM	#18
eskimosik Join Date Oct 2005 Posts 478 Senior Member	What attempts are you making to store heat? Do you have large (sealed) barrels of water in the green house under the benches to hold heat? The problem with a big empty green house is that air doesn't hold warmth very well. Unless you fill the g/h with something with a high heat capacity (i.e. which can hold heat) the g/h very quickly bleeds heat. Also, if you haven't properly double-glazed the root and sides then the heat escapes all the faster. If you are using glass then the problem is all the worse as glass is an excellent conductor of heat. You want to be using polycarbonate or something similar with at least a 1 inch gap between the two sheets.
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