If you are buying wire for a (like Nest or Ecobee), do not settle for anything less than a 5-conductor cable. Learn about the common or C wire - Google Nest Help
When shopping, you’ll see labels like or 18/8 . Here is how to read them: buy thermostat wire
The Ultimate Guide to Buying Thermostat Wire: What Every Homeowner Should Know If you are buying wire for a (like
Standard for most modern heat/AC systems. It includes the crucial C-wire . 8-Wire: Recommended for heat pumps or multi-stage systems. 2. The "C-Wire" Factor buy thermostat wire