The answer to 'lifespan of dimmer switch' is that a well-maintained dimmer switch can last 10-20 years or more with normal residential use. Dimmer switches are designed to handle the electrical load of controlling the brightness of lights, but they can wear out over time due to the constant switching and heat buildup. Proper installation, avoiding overloading, and regular inspection can help extend the lifespan of a dimmer switch.
The key factors that affect a dimmer switch's lifespan are the quality of the switch, the electrical load it's handling, and how often it's used. Higher-quality dimmers from reputable brands tend to last longer than cheaper models. Additionally, if a dimmer is controlling a large lighting load, it will wear out faster than one controlling a smaller load. Frequent use, such as in high-traffic areas, can also shorten the lifespan compared to a dimmer that's only used occasionally.