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24 VAC. The connection will depends of your equipment and the numbers of the available wires in your old thermostat.
Sorry, there was a problem. Please try again later.Hello - Thank you for taking the time to submit a question in regard to our Cync Smart Thermostat. We will need a bit more information in order to give you the most accurate information. Please consider contacting us directly at 1-844-302-2943 and a member of our support team will gladly assist. -Cync Support
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