Cheap DIY AC/CO2 two in one!

What if you just replaced the frozen water bottles with dry ice?? I've used big blocks of dry ice at work, and a 5" block without insulation next to the dumpster stayed frozen all day in 70+ degree weather. So I know they would last way longer in a cooler, even if warm air IS being pumped in, and the dry ice turns into a constant stream of carbon dioxide for the plants to use. Seems like you could do this REALLY inexpensively. Whatcha think? This is NOT my video, i was just surfing YouTube

[video=youtube;xRXCdy05bJs]http://www.youtube.com/watch?v=xRXCdy05bJs&feature=fvw[/video]

It can really only supply co2, because to get effective cooling from something like this you'd be pumping in waaay too much co2. No good way to control its release either.

I don't think you'd be pumping in too much co2, if anything not enough. Dry ice doesn't melt very fast at all, it would mostly just be cooling the regular air that the fan is sucking in and blowing it out colder, with maybe a tiny added level of co2. I'm not saying submerge the dry ice in water to make it "fog", but instead simply using it as a more effecient and effective substitute for frozen water.

Effect for ac, yes. co2, not as much. I think it would just melt way to slowly for it to be an effective source of co2. not to mention i think it would leave your grow room a lot colder than you want it. But I could be wrong.

what do you mean by "really inexpensively"? how much co2 is there in the cube? if you know then you will know the rate at which co2 is being released by calculating the time it takes for it to evaporate away, maybe you can try it with a co2 monitor and sealed room and report results but it sounds interesting, i'm imagining a system where you add several blocks and control the release with containers then releasing as much as needed using co2 monitor. i guess if it was economical, many people would have thought of it, but theres no harm in researching it in detail i like to know stuff about stuff lol

I like how the laser thermometer prolly cost 10x times as much as all those parts combined