Easy to make "AC" unit

For my grow box, I have two 3" computer fans for my intake, and two 4" computer fans for my exhaust. I'm running three 30-watt CFLs and two 26-watts as well. My temperatures were around 83 degrees and I wanted to bring them down to about 76-79 degrees. So I began pondering after viewing this:
https://www.rollitup.org/cfl-growing/407358-cheap-2-1-airconditioner-carbon.html
and came up with this:

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This is a picture of my intake fans behind my box. I have the top fan screwed onto my box from inside of it, and the bottom fan is screwed onto my box from outside of it.
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After that, I made my "AC" unit. I took two sports water bottles, cut them to make a elbow to fit into the tupperware. I'll be putting a frozen wattle bottle into the white one.
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I then mounted it by taking screws and screwing them through the tupperware sides onto my box. The tupperware fit over my fan, so when the fan would run, it will suck the cold air from the frozen water bottle and cool my box down which it did successfully.

PROS:
Brought my temper down to 77 during the night and 78-79 during the day. I keep 6 wattle bottles frozen and change them throughout the day. After the water bottle thaws out, my box manages to stay cool for another 1.5-2 hours.
CONS:
The water bottles thaw after around 2 hours so you might find yourself changing the bottles 4-5 times a day.

I would like to make a more longer lasting "AC" unit so I thought I'd start this thread to get some feedback and possibly discuss some alternatives. What are your thoughts?
 
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