Against Continued Repairs, Four-Stage Analysis Reveals When HVAC Replacement Makes Sense

https://www.scribd.com/document/1071157854/Static-Pressure-Balance-and-the-20-Rule-Drive-HVAC-System-Efficiency-Through-Proper-Duct-Engineering-213983

Your HVAC system's replacement timeline depends on a structured end-of-life assessment procedure that measures equipment age, operational condition, repair history, and efficiency decline