“Does this product interface with an ABCD type system from Carrier?”
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Your system may be compatible, but installation requires extra steps. If you enjoy DIY projects, please see our support article on proprietary systems installations. Or reach out to our friendly support team for assistance with your installation questions. https://support.ecobee.com/s/articles/My-communicating-thermostat-has-non-standard-proprietary-connectors-can-I-install-an-ecobee-thermostat
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