Are you really trying to keep it sealed up and warm with heater etc? Then yes the double poly works well. We put 4 mil inside and 6mil outside - UV protected - it will make a differance.
The fan intake will need a restritor or you will need an opening to release some presure. A1/4 hp squirl cage will do our 30' X 100' no problem.
Now the reality is that in the last 5 years I have been only running one sheet of poly and not using heat they way I was, too expensive and we are not growing the flowers in Feb any more.
The most important thing with a greenhouse is being able to move the air inside and or exchange it with an exhaust fan and roll up walls.
You are creating a great environment to grow plants, but also bugs and pathogens...
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Today's Featured Article - Farming Never Left My Blood - by Stan Gordon. I was born in 1947 youngest of ten of a working farm. Our farm was located in Saskatchewan near Saskatoon. We had a mixed farm consisting of grain and dairy all done with old machinery and by hand. My dad had a tractor, a Farmall A which was used mostly to run the thrashing machine, a seed drill and for plowing. I remember locals used to help each other and threshing was done from daylight to after dark, one farm to another until all farms were done.
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