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Ok, simple plan. Ac unit with dry ice box on front ---- > Dryer tube -----> PC case already beign cooled by ac in this fashion. Should I be  good on this one?

remember that dry ice is CO2, and will need to be vented outside somehow. 
other then that, dry ice is kinda expensive.

it will be very expensive as the dry ice will sublimate very quickly

Vented (preferably back into your grow room so you get bigger buds)

It wouldn't be economically viable. The the post above you have to work out extra venting since CO2 is toxic in large amounts. Also factor in how long it take a block to evaporate( correct substance change term? ), and the price of the block. You wouldn't see that big of a hash performance increase with the extra money you're spending.

Best post today.  Check your wallet! :)

I 2nd that......where do you think I got the dryer tube from? :)

It's CO2 not CO you shouldn't have to vent it outside as long as the room you are in isn't air tight or extremely small.  Depends on the quantity of dry ice you are vaporizing.  I wouldn't expect the CO2 concentration to raise more than a few tenths of a percent, even with a fairly large block of ice like 3-5 lbs.

It is kind of expensive which I don't think will result in any profit increases.  You are already using a refrigiration unit to cool the miner your so your PUE is already 2 which means you are paying twice for the electricity to mine. Once to run it and once to cool it.  If you want to improve your profits, don't overclock excessively creating heat, you want to find a way to reduce the cost of cooling your miners

Why would you necessarily lose the CO2?  Couldn't you do this as a closed cycle where the CO2 vapor just passes its heat back to the surroundings but still returns back as liquid coolant?  (Of course, it wouldn't be "ice" then.)

Yep! Not worth it unless you do it like a real overclocker does it! In a pot, with acetone! The difference in temp between the cold AC air and the DICE is so minute, that it would make very little difference if any at all!

In oreder to store liquid CO2, it would have to be under high pressure. Also, liquid CO2, probably not the best conductor of heat!

@OP
I would say water cool if you need extreme cooling! My cards sit @ 37°C 24/7, and my CPU never sees 50°, thanks to water! ;)

problem is dry ice doesnt "melt" into liquid, it sublimates, or goes directly from solid to gas.
Condensing CO2 gas into liquid  can only be done at 5 times normal atmospheric pressure.

so, no, that wont work

Save it for dry ice bombs.

Hahaaa thxx dogg! right on, glad someone gets my sense of humor lolz

get water blocks and make a chiller whit your ac

Just throw the whole rig in the freezer  :D

Oh for the people who say the ac dosent help...
Well it has a required powersave move where after 15 min it will pause for 2 min. During that time my 1025mhz 5770 running at 230k rises in temp from 71 to 80. The ac turns back on and down to 71 in 5 min.
I did a quick experiment with some dry ice right now and this is what I discovered. By placing it in the dry ice in box I use to connect the ace to the 6 feet of dryer tube, I got the temp down to 54 for about 25 min before the began to raise. Chunk was 1/2lb at $3/lb so not cost effective at all. However I did get the 5830 to 410.

Buying dry ice to use as a long term cooling solution sounds about as practical as buying hot coffee frequently, to fill your radiators with, to heat your home in the winter. :P

Couldnt have said it better myself.

And, STARBUCKS, at that.