I've done them in a few older homes. some of them do need an extra "power" wire run, to power/charge them when the furnace fan is off, but 95% will work as is. They are generally pretty simple to connect. Some of the newer ones like the new google Nest actually come with a remote sensor and that capability. We may do that eventually here, we added vents into the garage which is now our workshop and quilting/embroidery area, no sensor out there. Would be nice to have one there eventually.
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Yeah, I don't have the yellow power wire or whatever it is. I could get one of the ones that uses batteries, but I don't feel like having to replace them all the time. It's always freezing in our downstairs, especially when the A/C is on. We also get a lot of direct sun in the evening on one side of the house, so it heats everything up.