“Will this thermostat work on a Heating/Cooling unit that is 23 years old?”

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• If your system had C = common signal, it should work.

  Answered by wifithermostat 6 years ago

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• Hi Eug5150, this thermostat will work with most 24-volt heating and cooling systems. This thermostat does require a common (C) wire connection at the thermostat and your heating and cooling system. If you need additional assistance, please contact us at 1-855-733-5465, chat, email, or at Honeywell Home on Twitter and Facebook.

  Answered by Honeywell Support 6 years ago

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