Yes, a Nest thermostat can potentially cause issues with your air conditioning unit if it is installed incorrectly or lacks adequate power delivery. Specifically, if a Nest thermostat is installed on an HVAC system without a dedicated C-wire, it attempts to trickle-charge its internal battery by stealing power through the cooling relay wires. This improper power-stealing can cause AC contactor relays to buzz, short-cycle the compressor rapidly, or trigger unexpected system lockouts during peak cooling demand. Verification: Ensure a dedicated blue C-wire is connected to the 'C' terminal on both your air handler control board and your Nest thermostat subbase.
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