Pat thanks for the response, can I ask where you are from (aka do you have
the nasty cold freezie winter) I have had some water accumulate near the
ground in the bubble and thats what inspired my question.

Thanks

"Pat Brennan" wrote in message
...
All the books say draw the air from the outside, every greenhouse I have
seen draws from the inside. The blowers sold for inflation are made to go
on the inside and use inside air. I have never had a problem and all my
greenhouse use inside air. If you are not having problems with water and
things growing between the layers, I would not worry about it.

Pat

"David Jewell" wrote in message
.. .
I put a greenhouse up this summer and am confused about a point and was
wondering if anyone could answer this one for me. I currently inflate
the
greenhouse with air from inside the greenhouse but have been told I
should
be drawing air in from the outside.

With drawing the air from the inside I am thinking that the bubble will
be
warmer and give me better insulation but I am concerned with the issue
of
water collecting in the bubble. With drawing air from the outside I am
thinking that the air will be a lot colder and thus not so good for my
orchids.

Any advice would be greatly appreciated.

Dave (Ontario, Canada)