Condition
Weak Airflow from All Vents
Airflow is reduced at every supply register in the home. Typically indicates a system-wide restriction: filter, blower, or evaporator coil.
Possible Causes
Severely Clogged Air Filter
A dirty filter restricts airflow, putting strain on the blower motor and reducing efficiency.
Root Cause Analysis →Diagnostic Tests
- Remove return filter
- Measure airflow velocity at supply register
- If airflow increases → filter restriction confirmed
Repair Options
Dirty Evaporator Coils
Dust buildup on the coils restricts airflow and stops heat absorption.
Root Cause Analysis →Diagnostic Tests
- Remove evaporator access panel
- Inspect coil surface
- Check temperature delta across coil
Repair Options