Continuing Repairs on 18-Year-Old HVAC Units Traps You in Escalating Failure Liability

https://blogfreely.net/lithilszxt/h1-b-central-ac-replacement-costs-rise-when-airflow-engineering-is-overlooked

Most HVAC systems reach the end of their practical lifespan between 15 and 20 years, and attempting to repair units beyond that window creates sunk-cost risk: you invest in repairs that fail again weeks later, repeat-failure exposure multiplies, and