Neat Chinese thermostat heating/cooling module.

There are quite a few thermostat modules on eBay, but this one is different in that it has a nice clear display of all data and is super simple to use for either heating or cooling.
You basically just set the temperature that the load will turn on and off and it knows from the direction whether it's a heating or cooling application. Hysteresis is simply set as the difference between the on and off temperatures.

the circuitry and software is super simple, so reliability should be good. There's polarity protection and the volt-free relay contacts are rated 10A resistive, but probably better used at a lower current.

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