Lifetime TEC
The lifetime expectation of Peltier elements (TEC's) is very long on condition that they are correctly applied.
Because there are no moving parts, the lifetime can be over 30 years. Important is that there are no external forces on the element. Clamping construction with heatsinks causes tension in the element. Together with the tensions created by expending and shrinking of the material caused by temperature drops, can result in defect systems.