Let me clarify -- the cost for the greenhouse is not included in my $5000 budget for the system. That amount is specifically for the AP system itself. AND, I was told that if that amount is not sufficient - then I should increase the amount.

The students will not be outside during winter for any extended amount of time, so other than them wearing jackets to and from the building - I don't think that heating will be an issue.

Also in terms of size and capacity issues -- what size greenhouse do you think would be necessary for me to house an AP system AND ~20 people?

Green Phoenix