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What I want is a solution that will allow me to monitor the temps on a webpage, and automatically activate some form of cooling system when needed, without me having to go open the door for a bit



In that case you want something like this. With this RS232 board you can read the temperature and control devices via the relays it provides.

The serial commands are all simple, it could all be implemented with some simple Linux shell script and a crontab job.

It isn't available as a kit, only a ready built board, but it is still only £30.
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