Yeah, I looked into it a while ago and there is like a yellow line that provides constant power to the thermostat. If you don't have it, then they make them with batteries, but you have to keep replacing them all the time. Not a huge deal, but if they happen to go out on you while you are away on a trip and you want to crank the heat or A/C for when you get home, it's not going to work. Definitely a first world problem in the grand scheme of things!
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That would be such a pain! I wonder how hard it would be to run that power line? The wiring to our condo thermostat was like a literal rat's nest. The electrician we hired surrendered and gave up while trying to install our Nest in 2008.
Oh wow, that is horrible. I think the line pretty much runs straight down, but I think I would have to run all new lines so I could use the old one to pull the new one. I'm not sure it is really worth putting a ton of time into it if we are going to eventually move. Sadly that's kind of our attitude with a lot of things in this house right now!