I have a heat problem in my grow, so I figured I could grow with added co2. I'm broke most of the time lol, so I made one of these; How to build a Cheap CO2 generator - Stoner Forums - A Marijuana & 420 Friendly Community. Increased co2 allows the stoma to stay open during high heat 80F+. My plants love it, I have three generators for an average sized closet.

P.S.sorry about posting about another website.

I've never tried the co2 route. Would have to drive almost 100 miles to the nearest tank supplier, and I can't afford it anyway.
These techniques do me fine for now. (unless the A/C goes out)

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