I've been wanting to upgrade my thermostat to a smart one -- I only have an in-floor furnace, so the utility isn't super necessary, but I'd like to have a smart thermostat anyway (so I can turn my heat on as I'm making my way home).
I believe I have a millivolt system -- as I have a Honeywell TS812A1007, which is a millivolt controller. I've read online that it is possible to uprade to a smart thermostat, but that I'll need something like a 24VAC Transformer
Below is the back of my thermostat:
My questions is: is this 24VAC Transformer something I can just add on to where the thermostat lives (i.e., is it just a need for power to the thermostat) -- or do all of my options involve adding a new wire from my furnace? I've got a hunch that snaking a new wire up to the thermostat from the furnace will be the most difficult/expensive part, so if I can just run a plug to the new thermostat and have it use that + the 2 existing wires, then this won't be too difficult.
I've been trying to make sense of the thermostat schematics people have posted, but I am very novice at electricity/wiring (and by novice, I mean I got a C in high school physics and that's the extent of my expertise).