the smaller the compressor the quieter it will be. 1/4hp or refrigerator compressors are commonly silent while the AC compressors do make a little noise. I guess it depends on what compressor you are going to use
I think stores that sell fishing supplies have dry ice. In a closed... (DO NOT COMPLETELY SEAL) envirornment a 12x12x2" chunk would last a couple of hours I'd guess. for the trouble and how long it lasts just get some liquid nitrogren it cools better and this isn't going to be permanent either way.....unless every 3-4 hours you want to run dwn to your freezer and grab another chunk of dry ice!
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