wrote in message
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The polycarbonate greenhouse I have had for 4 years is just about
falling apart. It has cracked to the point that I am not even going to
try to heat it this winter. The plan is to build a "real" one with
glass windows / panels and a real door. The size will be the same, 5 x
9, because the base is already bolted into the concrete but I can go
up in height. I have a 7 bucket hydroponic system that I will continue
to use but there should be room for more dirt gardening as well. Ideas
for me, things I haven't thought of? I will need some kind of
ventalation, maybe just opening windows. I am in eastern North
Carolina. What do you think?
MJ

There are devices that operate windows automatically using the heat build up
for power. I'm sure you can find them at a greenhouse supply. You might
also consider the double layer poly method rather than glass for the cover.
The layers have air pumped between them and does insulate to some degree.
There is a grower (Van Wingerden sp.) a few miles west of me that has about
20 acres of greenhouses that use that method. Apparently it's the most cost
effective way. Either way best of luck,
Steve