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This is a very helpful reply, thank you. I am doing exactly as you said and focusing on the 4 basic connectors. I have ordered a wi-fi thermostat that will use the C connector... my non-wifi new...

Hello,
I had a carrier Thermostat that I broke while moving a book case. I quickly bought a Honetwell Thermostat from Home Depot but am now confused about the wiring. The old Carrier had the...