Poor Airflow

Common Symptoms

You might be experiencing this problem if you notice any of these signs:

• Weak air from some or all vents
• Some rooms don't heat or cool
• One room much warmer or colder
• Air feels weak even at vent
• Noticeable decrease in airflow
• Longer heating/cooling cycles
• Higher energy bills
• Whistling from vents or ducts

Step-by-Step Diagnosis

Follow these steps to identify the exact cause of your problem:

1. Test airflow at each vent with hand
2. Check if problem is all vents or specific rooms
3. Inspect air filter - hold up to light
4. Verify all supply vents are open
5. Check return vents for blockages
6. Listen for blower motor sounds
7. Inspect vents for closed dampers
8. Check for furniture blocking vents
9. Feel if air pressure seems weak at unit
10. Look in attic for disconnected ducts
11. Check for closed doors blocking airflow
12. Note if problem is worse in certain rooms

Most Common Causes (Ranked by Likelihood)

DIY Solutions

Step-by-Step Instructions:

1. Replace air filter immediately
2. Walk through home and open all closed vents
3. Remove furniture and curtains blocking vents
4. Locate and clear return air vents
5. Check attic for disconnected duct sections
6. Reconnect loose ducts with metal tape or mastic
7. Look for crushed flex duct in attic
8. Inspect for closed dampers in main ducts
9. Open all interior doors or install jump ducts
10. Remove vent covers and vacuum dust buildup
11. Check for and remove any items in ductwork
12. Use CFM calculator to verify proper system sizing

When to Call a Professional

Don't attempt DIY repairs if you experience any of these situations:

• Airflow weak after filter replacement
• Suspect major duct leaks or disconnections
• Blower motor sounds weak or struggling
• Need ductwork redesign or replacement
• Multiple rooms have chronic airflow issues
• Significant whistling from ductwork
• Recent addition to home with poor airflow
• Ducts in inaccessible locations

Prevention Tips

Stop this problem before it starts with these preventive measures:

• Replace filters monthly during heavy use
• Never close more than 20% of vents
• Keep vents clear of furniture
• Inspect ductwork annually if accessible
• Install properly sized return vents in each room
• Seal duct connections with mastic, not duct tape
• Balance system with dampers after installation
• Get duct design evaluation before major renovations