National HVAC replacement costs average $5,000 to $15,000 per system lifespan
https://precision-reputable-hvac.trexgame.net/ac-compressors-reach-end-of-life-reliability-between-12-and-15-years-of-service
Most residential HVAC systems last 15 to 20 years, but replacement decisions hinge on cost-data benchmarks rather than age alone