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C Wire Accessory Common Wire Kit for Most 24 VAC Thermostats (4 to 5 Wires), White (1 Pack) : Amazon.co.uk: Business, Industry & Science
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
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hvac - How can I modify a 4 wire thermostat to a new thermostat requiring c wire? - Home Improvement Stack Exchange
Everything You Need to Know About Your HVAC Thermostat Wiring
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Cync Thermostat Wiring Configuration and Installation Guide
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HVAC PROBLEM SOLVER
Thermostat Wiring Explained! How To, Color Coding, Types & More
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