I use a Dasani Water fridge the exact same size as your Coke as my main cooker -- I LOVE IT!!!
I agree that you must watch the heat from ANY fan you use. Many will generate to much heat.
I use a desk fan with a very small magnet. I bought them a a CVS pharmacy for $10. I have been using the 1st of 4 that I bought for almost a continuous year!! When you find one that works for you, buy a few extra.
I also use a Herpstat and heat tape. Good luck and beware of the HOT FAN!!!!!!!!Happy cooking...
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