Condition
Weak Airflow Upstairs Only
Second floor or upstairs rooms have noticeably weaker airflow. Common with single-zone systems and duct design issues.
Possible Causes
Leaking Air Ducts
Gaps in the ductwork allow conditioned air to escape into unconditioned spaces like attics.
Root Cause Analysis →Diagnostic Tests
- Visual attic inspection
- Static pressure measurement
- Smoke leak test
Repair Options
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