Google Nest Learning Thermostat (4th Gen)

Best Buy 1-star review by paiken (title: "WiFi issues"). Spent about 5 hours trying to connect; Nest said it was a firmware issue and owner returned the unit.

Best Buy 1-star review by MichaelS (title: "JUNK DO NOT WASTE YOUR MONEY"). Network connectivity failed before 5 months (could not find Wi-Fi networks). Support admitted defect but required burdensome replacement policy before shipping a replacement.

Best Buy 1-star review by user675813 (title: "Worst product ever"). Three Nest thermostats in under 18 months: Wi-Fi failures and units that broke completely; called Google support useless and warned others away.

Best Buy 1-star review by BellaG (title: "Absolutely Avoid!"). Pros bypassed the Nest and confirmed the York A/C worked; fault was the 4th-gen Nest keeping the fan running without cooling. Replaced the Nest.

Best Buy 1-star review by BaileyJ (title: "DO NOT BUY, can't turn Eco mode off"). Fifth Nest over about 4 years (warranty + out-of-pocket); 4th gen runs about 15 minutes then flips to Eco and Eco cannot be permanently disabled. Switched to Ecobee (~$120).

Best Buy 1-star review by PETERK (title: "No connectivity with furnace"). Furnace tech replaced a controller board trying to get Nest to communicate with no luck; Best Buy refused return after 15-day window (owned about 2 weeks of troubleshooting).

Best Buy 1-star review by LG75inTV (title: "will not stay connected to phone"; owned 1 week). Stopped communicating with smartphone and would not reconnect though phone connected to all other home devices.

Best Buy 1-star review by bennlaf (title: "Broken out of the box"; owned 1 week). Unit dead out of the box; returning.

Best Buy 1-star review by BellaG (title: "Absolutely Avoid!"). After professional install, fan kept running without cooling the home. Pros bypassed thermostat and confirmed AC was fine—fault was the Nest 4th gen; replaced it.