The primary downsides of using a Google Nest thermostat include frequent requirements for a dedicated C-wire for stable continuous power, reliance on cloud-based servers for full smart functionality, and limited out-of-the-box support for Apple HomeKit unless using specialized bridge solutions. Additionally, premium models carry a high retail price point, and privacy-conscious users may express concerns over data collection policies tied to Google's smart home ecosystem accounts. Verification: Inspect your HVAC wiring bundle for an unused blue C-wire before installation to avoid unexpected power limitations.
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