“are the Honeywell smart thermostats compatible with an ABCD wiring. The nest is not. Thanks,”
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Hi Epk! Unfortunately, ABCD wiring is proprietary communicating wiring. This type of wiring is not compatible with Honeywell thermostats. Please contact your local licensed HVAC professional for assistance in determining a compatible thermostat or if your system can be converted to a standard wiring protocol. Hope this helps!
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