“Is the Nest Smart Programmable WiFi thermostat model GA02081-US compatible with our Heil multi speed furnace Model H9MVX080J20A1 10 year old furnace? We’re having trouble getting the AC to work. There are 5 wires going into the nest. Heat works fine!”

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• Nest Learning Thermostat is compatible with system fans that have up to three speeds. Here's a helpful link: Fan compatibility with Nest thermostats: https://support.google.com/googlenest/answer/9259652 We suggest contacting our support team to guide you with the compatibility. You can reach out to use through this link: https://support.google.com/googlenest/gethelp

  Answered by Nest Support 4 years ago

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