Smart Home Device

Google Nest Learning Thermostat (4th Gen)

What is likely to break, when it happens, and how expensive it can be — from source-linked reports.

Reliability signal F · Early signal · data confidence Low

9 failure reports

Reliability summary

What is likely to go wrong, when it happens, and how expensive it can be — from source-linked failure reports.

Reliability signal

9 failure reports · Early signal · Data confidence: Low

Most common issue: Wi-Fi connection failure / firmware issue
Typical first failure: 0.5 mo; Median of reports with timing
Median repair cost: $170; Reported costs only
Highest reported repair: $220; Not a guarantee

What breaks?

Failure types

Click a type in the reports section below to filter.

Wi-Fi connection failure / firmware issue1 · 11.1%
Wi-Fi connectivity failed within five months1 · 11.1%
Repeated Wi-Fi / total failures across replacements1 · 11.1%
Thermostat fault kept fan running without cooling1 · 11.1%
Forced Eco mode / fifth unit replacement1 · 11.1%
Would not communicate with furnace1 · 11.1%
Lost smartphone connectivity / will not reconnect1 · 11.1%
Dead on arrival1 · 11.1%

When does it break?

Failure timing

Months after purchase, using reports that included timing.

What does it cost?

Reported repair costs

Distribution of owner-reported repair costs — not a quote or guarantee.

Median months to failure

0.5

Failure reports

Median repair cost

$170

Still recommend

% repaired

11.1%

% mfr warranty

75%

% extended warranty

—

% support helpful

Use these reports as a risk signal, then check current listings before you buy.

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What breaks?

What breaks? · reports

Wi-Fi connection failure / firmware issue

Wi-Fi / firmware

0 months

Source-linkedVerify source — Best Buy review

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.

UnverifiedEvidence ★★★☆☆

View report details

Months until failure

0 months

Repair cost

Not stated

Repaired

Manufacturer warranty

Not stated

Extended warranty

Not stated

Support helpful

Not stated

Would recommend

AI extraction confidence

88%

Verification status

Unverified

Evidence quality

★★★☆☆ (3/5)

Wi-Fi connectivity failed within five months

Wi-Fi radio / networking

5 months

Source-linkedVerify source — Best Buy review

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.

UnverifiedEvidence ★★★☆☆Mfr warranty

View report details

Months until failure

5 months

Repair cost

Not stated

Repaired

Manufacturer warranty

Yes

Extended warranty

Not stated

Support helpful

Would recommend

AI extraction confidence

91%

Verification status

Unverified

Evidence quality

★★★☆☆ (3/5)

Repeated Wi-Fi / total failures across replacements

Wi-Fi / thermostat electronics

5 months

$220

Source-linkedVerify source — Best Buy review

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.

UnverifiedEvidence ★★★☆☆Mfr warranty

View report details

Months until failure

5 months

Repair cost

$220

Repaired

Yes

Manufacturer warranty

Yes

Extended warranty

Not stated

Support helpful

Would recommend

AI extraction confidence

92%

Verification status

Unverified

Evidence quality

★★★☆☆ (3/5)

Thermostat fault kept fan running without cooling

Thermostat control outputs

Source-linkedVerify source — Best Buy review

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.

UnverifiedEvidence ★★★☆☆

View report details

Months until failure

Not stated

Repair cost

Not stated

Repaired

Manufacturer warranty

Not stated

Extended warranty

Not stated

Support helpful

Not stated

Would recommend

AI extraction confidence

91%

Verification status

Unverified

Evidence quality

★★★☆☆ (3/5)

Forced Eco mode / fifth unit replacement

Thermostat software / Eco control

11 months

$120

Source-linkedVerify source — Best Buy review

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).

UnverifiedEvidence ★★★☆☆Mfr warranty

View report details

Months until failure

11 months

Repair cost

$120

Repaired

Manufacturer warranty

Yes

Extended warranty

Not stated

Support helpful

Not stated

Would recommend

AI extraction confidence

90%

Verification status

Unverified

Evidence quality

★★★☆☆ (3/5)

Would not communicate with furnace

Thermostat / HVAC communication

1 months

Source-linkedVerify source — Best Buy review

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).

UnverifiedEvidence ★★★☆☆Not under mfr warranty

View report details

Months until failure

1 months

Repair cost

Not stated

Repaired

Manufacturer warranty

Extended warranty

Not stated

Support helpful

Would recommend

AI extraction confidence

88%

Verification status

Unverified

Evidence quality

★★★☆☆ (3/5)

Lost smartphone connectivity / will not reconnect

Wi-Fi / app connectivity

0 months

Source-linkedVerify source — Best Buy review

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.

UnverifiedEvidence ★★★☆☆

View report details

Months until failure

0 months

Repair cost

Not stated

Repaired

Manufacturer warranty

Not stated

Extended warranty

Not stated

Support helpful

Not stated

Would recommend

AI extraction confidence

88%

Verification status

Unverified

Evidence quality

★★★☆☆ (3/5)

Dead on arrival

Entire unit / power

0 months

Source-linkedVerify source — Best Buy review

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

UnverifiedEvidence ★★★☆☆

View report details

Months until failure

0 months

Repair cost

Not stated

Repaired

Manufacturer warranty

Not stated

Extended warranty

Not stated

Support helpful

Not stated

Would recommend

AI extraction confidence

91%

Verification status

Unverified

Evidence quality

★★★☆☆ (3/5)

Thermostat control failure (AC fan runs without cooling)

Thermostat control logic / HVAC signaling

0 months

Source-linkedVerify source — Best Buy review

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.

UnverifiedEvidence ★★★☆☆

View report details

Months until failure

0 months

Repair cost

Not stated

Repaired

Manufacturer warranty

Not stated

Extended warranty

Not stated

Support helpful

Not stated

Would recommend

AI extraction confidence

92%

Verification status

Unverified

Evidence quality

★★★☆☆ (3/5)

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