When in the year do owners report it?

NHTSA owner complaints about this part run furthest above the usual seasonal share in November: about 43% more of them name an incident that month than complaints about any part would predict. A complaint is a report, not a measured failure.

Complaints by month of the incident, against all complaints

What it shows: November is the largest at 10% (all: 7%), followed by January at 10% (all: 9%); the smallest shown is June at 6% (all: 9%).

Source: NHTSA owner complaint files · file downloaded 2026-10-05

Data and chart by CalcScrape: Thermostat Replacement Cost Calculator