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)