Static-pressure decline at 15 years signals when your HVAC system requires replacement evaluation
https://precision-hvac-sacramento-crew-sac-near-sutter-park1477.evergrovio.com/posts/know-your-system-s-age-before-deciding-repair-or-full-replacement-today
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