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Honeywell Home C-Wire Adapter for Honeywell home Wi-Fi Thermostats and RedLINK® 8000 Series thermostats THP9045A1098 - Amazon.com
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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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electrical - Where should I connect the C wire in a Janitrol furnace? - Home Improvement Stack Exchange
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The Smart Thermostat C Wire Explained - What If You Don't Have One? | Smart thermostats, Thermostat wiring, Thermostat
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Google Nest Power Connector - C-Wire Substitute - Compatible with Nest thermostats GA02493-US - The Home Depot
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