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Hey there! Thanks for your interest. The Nest thermostats are designed to work with most 24 V systems, including old systems. The brand or model doesn’t matter, you’ll only need to know what type of system you have. You can visit our website to learn more about the Nest Thermostat compatibility, here: https://support.google.com/googlenest/answer/9246656
Sorry, there was a problem. Please try again later.i had to return mine
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