Acuario, nice work. I don't think you need to add any frills to your web pages. That touch screen thermostat will put a nice face on the finished product.
Jeff, for the reasons you have cited, I'm an advocate of using an inexpensive PLC relay unit to do the dirty work at the heat pump as commanded by the system controller or thermostat (in this case, Arduino).
The simple ladder logic makes it possible to control a complex heat pump arrangement (compressor, pumps, fans, etc with a basic thermostat and these little PLCs can be found in the same price range as a basic Arduino.
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