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 - Bad Vibes - by Curtis Von Fange. One of the strangest ways to communicate with our tractor is to ask it how it feels. "Ask it how it feels," you say? Yup, ask it how it feels. Now, as with the other articles in this series one has to be able to hear what 'ole blue' is trying to say in response. The nice thing about our old iron friends is that they are usually quite consistent in their response, rather unlike some people I know who might change what they say due to the weather or other mitigating circumstances. But since t
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