And to further that... Don't do it to your orchids. Ethylene will take your flowers right off, and it might even damage more sensitive plants in moderate concentration.
Yes, I believe ethylene is used to force bromeliads. You aren't growing bromeliads... CO2 is often used to increase the growth rate of various crops, most especially ones that aren't legal to grow in the US. The profit margin is such that you could afford to add CO2. For orchids, which aren't terribly fast growing to begin with, I think CO2 supplementation would give you a very marginal benefit at best. I really doubt it is worth the effort. I'd invest in water quality, good fertilizer, and more lights, myself.
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Rob's Rules:  http://littlefrogfarm.com
1) There is always room for one more orchid
2) There is always room for two more orchids
2a) See rule 1
3) When one has insufficient credit to purchase more orchids, obtain more credit
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