International Compliance Association (ICA) Home Inspector Practice Exam

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Which component typically has the longest expected service life in home systems?

Heat exchanger
Furnace motor
Water heater
Thermostat

The correct answer is: Heat exchanger

The heat exchanger generally has the longest expected service life among the components listed in home systems. A heat exchanger is designed to operate over an extended period, often lasting 20 to 30 years or more with proper maintenance. This longevity is due to its construction and function, as it is not a moving part like the furnace motor or a component subject to constant heating and cooling cycles such as the water heater. In contrast, the furnace motor may have a lifespan of around 10 to 15 years and the water heater usually lasts between 8 to 12 years. The thermostat, while critical for regulating temperature, is typically expected to last around 10 to 15 years but may become outdated with technology improvements before it fails mechanically. Thus, the enduring nature of the heat exchanger in HVAC systems positions it as a key component with a significantly longer expected service life compared to the other options.