This is interesting and over my head. There's a Nest thermostat in this house from when the NDP gov't were handing them out and installing them, and I just checked and it has three wires. The furnace has to be late '80s (the earliest servicing sticker I can see is 1989.)
It'd be neat (and maybe pointless) if I could tie in the in-floor heating in the basement and master bath, which were added afterwards, and each have their own controls. Especially the basement. It's freezing down there in the winter and I basically always leave it on. It'd be nice if it could sense when someone's down there. I'm assuming I would need separate smart thermostats for each as they're in different parts of the house? One thing I won't be doing is running wires through walls.
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