A Guide to Smart Thermostats and the Critical Role of a Common Wire — Do I Need One?
# A Guide to Smart Thermostats and the Critical Role of a Common Wire — Do I Need One? *By Marcus Webb — 8 years enterprise network engineering, 6-year Portland home lab* ## The Short Answer If your HVAC system lacks power at the C terminal (common), you absolutely need an external low-voltage transformer to […]
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