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Hi DoesItWork, thank you for your question. If you are replacing an existing thermostat that was already working with your system we can help you checking compatibility. We need to know how many total wires you have and which terminals are being used on the thermostat that will be replaced. You can contact us at (800) 633-3991 or send us a Private Message at our Honeywell Home Facebook account. If you are not replacing an existing thermostat, please reach out to your HVAC contractor to help you check compatibility. - Maria
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