Re: aquarium green house anyone?
A well set up green house will have a louvered fan that is temperature controlled. As the greenhouse heats the louvers open up, and the fan comes on. The fan(s) are generally set up rather near the roof, so the hottest air is removed. The incoming air may pass through a swamp cooler, too. This humidifies it, and cools it.
Also, in really sunny places greenhouses will be whitewashed in the late spring, so the light is reduced. It is still quite bright in there, but many of the plants are native to the shadier parts of the forest, not the upper levels, exposed to direct sun. The filtered light is just right for many plants.
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