If you’re experiencing weak airflow from your vents, it can be both frustrating and uncomfortable, especially during the hot summer months. Several common issues could be causing this problem, and understanding them can help you troubleshoot or explain the situation to a professional technician. Here are the most frequent reasons for weak airflow and what you can do about them.

1. Dirty Air Filter

One of the most common reasons for weak airflow is a dirty air filter. When the filter is clogged, it restricts airflow, causing the indoor evaporator coil in your furnace or air handler to freeze up. This ice buildup blocks air from passing through effectively.


  • Replace the dirty air filter.
  • Turn off your system and allow the evaporator coil to defrost completely before turning it back on.

2. Dirty Evaporator Coil

Over time, the evaporator coil can accumulate dirt and debris, reducing its efficiency and airflow. This is another common cause of reduced air coming from your vents.


  • Turn off your system.
  • Clean the evaporator coil carefully. If you’re not comfortable doing this yourself, it’s best to call a professional.

3. Dirty Blower Wheel or Failing Fan Motor

A dirty blower wheel or a failing fan motor in your furnace or air handler can also lead to poor airflow. Dirt buildup or mechanical issues can prevent the fan from working efficiently.


  • Turn off your system to allow the evaporator coil to defrost.
  • Inspect and clean the blower wheel, or consult a professional if the fan motor is failing.

4. Low Refrigerant or Faulty Metering Device

Low refrigerant levels or a faulty metering device can cause the evaporator coil to freeze up, leading to restricted airflow. It’s important to note that your air conditioning system is a closed system, meaning you shouldn't need to add refrigerant unless there's a leak.


  • Turn off the system to defrost the evaporator coil.
  • Contact a professional technician to check for refrigerant leaks and service the system.

5. Too Many Vents Closed or Return Vents Covered

Sometimes, the issue can be as simple as having too many vents closed or return vents covered, which can restrict airflow throughout your home.


  • Ensure all vents are open and unblocked to allow for proper airflow.

6. Faulty Circuit Board

A malfunctioning circuit board can prevent the furnace fan from coming on, leading to inadequate airflow.


  • If you suspect a circuit board issue, it’s best to call a professional technician to diagnose and repair it.

Professional Help in Springfield, MO

If you’re in the Springfield, MO area and facing issues with weak airflow or any other HVAC problems, SS&B Heating and Cooling is here to help. With years of experience and a commitment to quality service, our professional technicians can diagnose and fix any issues with your system efficiently.

Why Choose SS&B Heating and Cooling?

  • Experienced Technicians: Our team has the expertise to handle all HVAC issues, ensuring your system runs smoothly.
  • Quality Service: We prioritize customer satisfaction and provide top-notch service for all your heating and cooling needs.
  • Training and Expertise: At SS&B Heating and Cooling, we regularly train our technicians on the latest HVAC technologies and practices, so you get the best service possible.


Weak airflow from your vents can be caused by several factors, from dirty filters and coils to mechanical issues and refrigerant problems. While some solutions can be handled by homeowners, others require professional expertise. If you're in Springfield, MO, and need reliable HVAC service, contact SS&B Heating and Cooling for prompt and professional assistance.

For more information or to schedule a service, visit our website or give us a call today. Keep your home comfortable and your HVAC system running efficiently with SS&B Heating and Cooling.

Struggling with weak airflow from your vents? Need AC service? Call us today! 417-580-9905, Fill out our online contact form for expert help.

SS&B Means Service To Me
Air Conditioners,Heat Pumps,Multi Zone Ductless,Single Zone Ductless,Tips