Static-pressure decline at 15 years signals when your HVAC system requires replacement evaluation
https://precision-insurance-approved.theglensecret.com/why-spending-4-000-to-12-000-on-hvac-protection-plans-saves-money-long-term
Most HVAC systems reach the end of their serviceable lifespan between 15 and 20 years, but airflow and static-pressure data tell the real story