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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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Venstar ACC0410 Add-A-Wire Accessory for 24 VAC Thermostats (4 to 5 Wires), White: Amazon.com: Tools & Home Improvement
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Thermostat Wiring Question - Home - Wyze Forum
hvac - How can I modify a 4 wire thermostat to a new thermostat requiring c wire? - Home Improvement Stack Exchange
Fast-Stat 1000 and Common Maker - Installation Guide – Simple
