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JJR2
Community Member
since ‎07-14-2025
‎07-14-2025

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How do I use U1 wires with Nest thermostat

07-14-2025
Just moved into this house. Original thermostat has 2 wires labeled U1. Don’t know what features might be connected to the A/C or heating that use these connections. How can these wires be connected to use the Google thermostat?Have photo, but don’t ...