YDDECW Thermostat Wire - 18/2 10FT Solid Copper 18AWG 2 Conductor Power Circuit Cable for Heating & air Conditioning Equipment, doorbells and Other Indoor/Outdoor Low Voltage Applications Use: Amazon.com: Tools & Home
100 ft. 18/2 Brown Solid Copper CL2R Thermostat Wire 210-1002CR - The Home Depot