No C-wire? Install a Nest thermostat at your own risk

Nest says you don’t need a C-wire – until you do. Read enough Nest reviews and you’ll eventually spot a common theme: Nests sometimes fail in systems without a C-wire. We were curious about these seemingly “random” Nest failures, so we called a few local HVAC companies and asked them for their off-the-cuff opinion on…
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