Do I Need a C-Wire for My Thermostat?

wiring - Can a thermostats C-wire be connected to the furnaces R-terminal without issues? - Home Improvement Stack Exchange

How To Add C Wire To Thermostat

TS2104 - C-Wire Adapter – TrickleStar

What Is The C-Wire On A Thermostat?

Does my old Honeywell thermostat have a C-wire? : r/HomeMaintenance

I have two separate R wires on my thermostat. What do I need to know about my ecobee thermostat installation?

Thermostat Wire Color Codes You Need to Know

TACO SR 504 C-Wire – mythoughtcube

HVAC PROBLEM SOLVER

How to Wire a Thermostat - The Home Depot