I use a really good heating system in the UK called Genius Hub, though sadly I cannot get it to integrate with smart things. There is no longer a house thermostat or reference room, every room is its own zone in the system with its own Danfoss Z-Wave TRV. There are motion sensors to turn the heating on and off in reception rooms which have variable occupancy. Saved around 30% off my gas bill, payback period about three years.
Everything talks to a separate Genius hub though. There was once a great community integration but it sadly died with the Groovy platform. Heat Genius Hub integration? - #7 by cumpstey
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