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This is definitely not product recommendation ... more like one of those "will I ever find time to finish" projects. I have had cheap thermostat which talks to the aircon+boiler controller over 3 wire relay controlled link (fan, heat, cool). I have seeded house + exterior with bunch of 433MHz wireless temperature + humidity sensors - which I read with cheap SDR. I control this with simple raspberry PI + relay board + simple program. It looks at outside temp on both sides of the house (to know about incoming sun heat). I have sensors all over the house to circulate air with fan only when there is enough heat/cold in some parts of the house (3 floors = top is warmer). So, it can easily be done as DIY without resorting to telling Gmen everything about self by means of Nest or similar. I wish to find time to finish it or get/install one of the polished open source home automation projects. .... Why all this? I did not find any open, reasonably priced, privacy respecting product AND I needed excuse to get yet another rPI. Hope that inspires, Tomas
