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You would be better off with a small window type airconditioner cooling a small room or large closet. Any condensation would form on the cold heat exchanger. On a hot day in Melbourne I run my airconditioner and set it to the temperature it would be at about twilight (guess). The optic is then the last thing to go outside. The standard thermostat in a fridge has a large temperature difference between off and on. You could get a better one from Jaycar where you can set these temperatures if you do use an old fridge. But you are playing with mains so a qulified electrician would have to install it.
Thats what makesthis hobby fun as there is no correct answer to a problem. We just try to make do.
Bert
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