Static-pressure decline at 15 years signals when your HVAC system requires replacement evaluation
https://precisiontrainedhvac.wpsuo.com/delaying-hvac-repair-in-a-2000-square-foot-home-escalates-costs-beyond-8000-annually
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