Blue "C" wire is connected to "Y" on old thermostat. New thermostat has separate "C" hookup. Where does the blue wire go - "Y" or "C"? : r/Nest
Missing C Wire? Install Wi-Fi Thermostat DIY With or Without C WIRE? - YouTube
What's a C-wire, and why should you care? - CNET
What If My Thermostat Doesn't Have a C Wire? | JTech Mechanical
Smart thermostat with no C-wire? : r/smarthome
Old furnace with no "C" terminal for wifi thermostat - Home Improvement Stack Exchange
No C Wire on Thermostat but Two C Wires on Furnace - Home - Wyze Forum
Thermostat C-Wire: How it Works on Your Thermostat | Honeywell Home
Do I Need a C-Wire for My Thermostat? | Malek Service Company
Fix Nest Thermostat C-Wire Issues Without Adding a C-Wire - YouTube
What is a C-Wire or Common Wire and How do I Know if I Have One? | Sensi US
How To Identify A Thermostat Common Wire (C Wire) & What It Does For Smart Thermostats - YouTube
Advice on how to wire a 4 wire RGWY wifi thermostat to an old hvac with no c wire? - Home Improvement Stack Exchange
What's a C-wire, and why should you care? - CNET
Trouble wiring with no C on the furnace board - Home - Wyze Forum
No C-wire? Install a Nest thermostat at your own risk – Smart Thermostat Guide
Fix Nest Thermostat Issues by Installing a C Wire - YouTube
No C wire on thermostat or furnace - DoItYourself.com Community Forums
Is the 'C' wire in my thermostat labeled as 'B'? : r/ecobee
How to install Nest Thermostat on an old furnace with no C wire? - The Nomad Studio
How to install Nest Thermostat on an old furnace with no C wire? - The Nomad Studio
