How long an Amana AC unit will last is 15 to 18 years with normal residential use and proper maintenance, which is similar to industry average for AC units of 15 to 20 years and identical to Goodman lifespan since same factory and components made by Daikin Comfort Technologies in Houston, Texas, and similar to Rheem and Ruud at 15 to 18 years but slightly shorter than premium Trane and Carrier at 16 to 20 years. Amana AC units including ASX14 14 SEER single stage, ASXC16 16 SEER two-stage, and ASXC18 18 SEER variable speed are built with Copeland scroll compressors and plate fin coils designed for 15-year service life but often exceed with care. How long it will last depends on climate, maintenance, and installation quality. In hot climate like Texas and Florida where AC runs 8 to 10 months per year with 3,000 hours annual run time, it will last 12 to 15 years due to more wear and tear and salt air corrosion near coast. In moderate climate like Ohio where runs 4 to 6 months with 1,500 hours annual run time, it will last 16 to 18 years. To make Amana AC last longest, change filter every 2 to 3 months to prevent high head pressure that strains compressor, clean outdoor condenser coil with hose monthly to remove dirt and leaves that block airflow and reduce efficiency by 10 to 20 percent, keep indoor evaporator coil clean with annual professional cleaning, and schedule annual tune-up at 100 to 150 dollars that includes refrigerant check. Amana offers lifetime unit replacement warranty if compressor fails in first 10 years indicating expected 15-year life.
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