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 - Show Coverage: Journey to Ankeny - by Cindy Ladage. We left Illinois on the first day of July and headed north and west for Ankeny, Iowa. Minus two kids, we traveled light with only the youngest in tow. As long as a pool was at the end of our destination she was easy to please unlike the other two who have a multitude of requirements to travel with mom and dad. Amana Colonies served as a respite where we ate a family style lunch that sustained us with more food than could reasonably fit into our ample physiques. The show at Ankeny
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