Side-by-side reliability

Google Nest Learning Thermostat (4th Gen) vs Google Nest Nest Learning Thermostat 3rd gen

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

Model A

Google Nest Learning Thermostat (4th Gen)

Reliability signal F · 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

Open full product page

Search Amazon

Model B

Google Nest Nest Learning Thermostat 3rd gen

Reliability signal — · Insufficient data · data confidence Very Low

1 failure reports · Insufficient data · Very Low confidence

Most common failure: Wi-Fi module dead
Typical failure age: —
Median repair cost: —
Highest reported repair: —