What is the average lifespan of a Lennox heat pump is 15 to 20 years with normal residential use and proper maintenance, which is similar to industry average for heat pumps of 14 to 18 years and similar to Trane and Carrier, but slightly shorter than gas furnace at 18 to 22 years because heat pump runs year-round for both heating and cooling, doubling run hours. Lennox heat pumps including ML14XP1 14 SEER single stage, EL16XP1 17 SEER two-stage, XP20 20 SEER variable speed, and XP25 23.5 SEER most efficient are built with heavy-duty coils and compressors designed for long life. Life depends heavily on climate, usage, and maintenance. In hot climate like Texas where heat pump runs 10 months, life is 12 to 15 years, while in moderate climate where runs 6 to 8 months, life is 16 to 20 years. Factors that shorten life include lack of annual maintenance with coil cleaning twice yearly, dirty filter causing high head pressure, and poor installation with incorrect refrigerant charge. Common parts that fail first include capacitor after 5 years at 150 to 300 dollars, contactor after 7 years at 150 to 250 dollars, and compressor after 12 to 15 years at 1,500 to 2,500 dollars. Lennox offers 10-year parts warranty when registered within 60 days. To maximize life, change filter every 2 to 3 months, clean outdoor coil with hose monthly, and schedule annual tune-up.
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