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Most 24 V heating and cooling systems are compatible with Nest thermostats, but there are some systems that aren’t compatible. We highly recommend checking your system’s compatibility before purchasing a Nest thermostat with our online Compatibility Checker. Also, you can quickly tell if you have one of these systems without having to use the Compatibility Checker or to look at your thermostat’s wiring. This online help article may help: https://support.google.com/googlenest/answer/9246656
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