Quote Originally Posted by da_natural

Forget it, I'm gonna ride with the 90 temps and see how it turns out. The shrubs don't look bad, so we'll see.
Why not consider adding CO2, if you can't lower the temp.
Your plants will grow very well up to abt 90 degrees with some extra CO2.

I know from the sound of things cost is a main issue, so gas controllers and generators are out, but......
Excello fizz pucks work well, and for your small cab. 1/2 or 1/4 tablet would do you, per day.

Or you can build a CO2 generator with a gallon jug 1/2 filled with water and add yeast and sugar. Duct tape a plastic hose from top of jug to your cab. (try to introduce it at the top of cab) for about $2.50.

good luck