I didn't have a live C wire when I went to hook up my Nest, but there were a couple of extra wires not hooked up to anything behind the old thermostat. It was pretty easy to open up the furnace and hook one of those up to the 24V slot, which then made the Nest install dead easy. Definitely not worth spending bucks on a tech, if your current thermostat doesn't have any wires labelled C just check the bundle behind it to see if there's an unused wire that you can convert
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