Side-by-side reliability

Google Nest Learning Thermostat (4th Gen) vs Kidde KN-COSM-IBA

Compare reliability signal, data confidence, common failures, typical age, and reported repair cost. Warranty window reference: 12–12 months depending on category.

Compare up to four products →

Model A

Google Nest Learning Thermostat (4th Gen)

Reliability signal — · Early signal · data confidence Low

9 failure reports · Early signal · Low confidence

Most common failure: Wi-Fi connection failure / firmware issue
Typical failure age: 0.5 mo
Median repair cost: $170
Highest reported repair: $220

Median months

0.5

% mfr warranty

75%

After warranty reports

Avg repair cost

$170

Top failure categories

Wi-Fi connection failure / firmware issue1
Wi-Fi connectivity failed within five months1
Repeated Wi-Fi / total failures across replacements1
Thermostat fault kept fan running without cooling1

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Model B

Kidde KN-COSM-IBA