“I have a newer HVAC heat pump with gas backup that uses eight wires. Is there any way to connect this Nest, which appears to have only six connectors, to my system?”
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The new Nest Thermostat won't be able to support the other wires for your heating and cooling system since it can only support up to 6 wires. We recommend using the Compatibility Checker tool to verify if your system is compatible with any of our Nest thermostat models: https://support.google.com/googlenest/answer/9246656
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