The average lifespan of a built-in over-the-range microwave typically ranges between 7 to 9 years when used regularly and maintained properly with routine cleaning. Because over-the-range models are exposed to continuous heat, steam, and grease splatters rising from the cooktop below while also handling heavy daily microwave usage, their internal cooling fans, magnetrons, and electrical components experience higher stress levels than standard countertop units. Regular cleaning of grease filters and proper ventilation usage help maximize their operating longevity before replacement becomes necessary.
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