Same idea as using AC to cool your rig room. You would need quite a freezer and your electricity costs for cooling would be high. It takes a heat load of 3517 Watts 24 hours to melt a ton of ice i.e. if you would like to keep the air around your 3517W rig at 0 degrees Celsius.

Hmmm, Thats a thought, Because I'm in a "colder" country I don't have AC, So when I GPU mine it actually offsets my heating bill, But when someone in a hot climate GPU mines it costs them more in cooling, But I never thought about the freezer as crazyates said, The condensation is just too dangerous.

about condensation: You could drill holes and seal them for the wiring, then fill the chest freezer with dry air or put in a few desiccant bags to have a humidity below the condensation point in there. But as you concluded yourself, the extra power costs makes it pointless. I have experimented with water cooling my GPU cores, and if they got below 35 degrees Celsius they hung after a few hours, so extreme cooling / overclocking might not be doable. Do anyone here know of anybody trying liquid Nitrogen on a graphics card?

well 95F wow, odd

I watch a lot of Breaking Bad and Gustavo Fring uses these refrigerated trucks to distribute methamphetamine around the southwest United States while submerged in buckets of ingredients for the restaurants which he uses as a front for his drug operation. Imagine getting one of these refrigerated trucks and setting up racks and racks of cards/systems within the refrigerated box portion of the truck.

I realize that running the truck 24/7 may be costly in terms of fuel, but I've heard that..... there's this car.... it runs on water, man!

EDIT: Now that I think about it, as the result of a recent face off, Gustavo Fring is currently no longer using these refrigerated trucks, so acquiring said vehicles may be a viable option after all!

You may want to use some of these Peltier units :

http://www.conrad-uk.com/ce/en/product/182620/HighTech-Peltier-element-QuickCool-Max-heating-power-270-W

A refrigerator only pulls the energy (heat) from the inside, and drags less energy into the inside. The hotter it is outside a fridge, it will get hotter inside the fridge.

A cold compressed solution going into fridge, cools stuff, heads to the back of the fridge, decompresses, and get cooled off with a fan in the back. Then it gets recompressed, making it cold, and pumped back into the fridge.

When my room was hitting 90'F in the summer, I had all of my windows open and fans blowing directly into my rigs. They never went above 80'C

My best idea would be to have a water cooled rig and have the reservoir in the fridge/freezer (obviously use anti-freeze if using a freezer). This would dramatically drop temps without killing the fridge/freezer. This would eliminate most of the condensation problems.

That is interesting.  I thought about putting my rig in a cooler, wine cabinet or something like that and what I could not get past is the condensation and or the risk of being to humid and then frying something.  I had an AC unit in a server rack but the cost to run it was too much.  The AC unit was killing the heat but it was also killing my profits so I killed it .

If you do the water cooled rig with a reservoir in the fridge post some pics.   

Once you start overvolting, overclocking increases the power consumption more than the performance of the GPU, so it may not be to your advantage.

If your AC unit has a COP of 6 that means it takes up 6000W of cold and puts it outside per 1000W of electricity used. I think the added cost running the AC will not be made up by overclocking in most cases.