No, replacing an existing thermostat with a Google Nest is generally a straightforward DIY project that takes about 30 to 45 minutes for most homeowners. The process involves turning off HVAC power at the breaker, labeling existing low-voltage wires (such as R, W, Y, G, and C), mounting the new Nest backplate, and plugging the wires into the matching terminals. However, if your home lacks a required C-wire and requires running new thermostat cable through the walls, the process becomes more complex. Verification: Take a photo of your existing thermostat wiring before disconnecting anything to ensure accurate color-coded re-attachment.
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