. The original thermostat does not allow precise temperature control (i.e.: 4°C), it only has vague "levels of cold" (i.e.: 1 ... 5). Since I need to maintain some precise temperature, I have to resort to a different solution.
As mentioned, I've already done it with an off-the-shelf temperature controller, but now I want to be able to monitor (and control, to a certain degree, i.e.: bypass) the situation remotely, so I need to build my own web-enabled temperature controller.
Thanks for the hint!