Weak Airflow from Vents

After filter changes, the next most common cause is closed dampers, blocked returns, or leaky ducts.

Difficulty: Easy Time: 15–30 min Cost: $0–$20

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1

Open every vent

Check that all supply vents are fully open and not blocked by furniture or rugs.
2

Inspect returns

Returns (the big grilles, usually low on a wall) need to breathe. Move anything in front of them.
3

Look at accessible ducts

In a basement or attic, look for flex ducts that have collapsed or sagged. Straighten and support them.
4

Seal joints with foil tape

If you see gray sealant cracking or gaps at duct joints, wrap with foil HVAC tape. Cloth duct tape fails within a year.