Having problems with your air flow? Free and consistent air flow is crucial to the efficiency and performance of your HVAC system.

Your HVAC air flow can be compromised for any number of reasons, so it is important to address the issue as quickly as possible to find the right fix.

How do I know if I have an HVAC air flow problem?

There are several indicators that can make you aware that you are not getting sufficient air flow from your HVAC system.

Some signs to watch for may include:

  • Uneven heating
  • An imbalance of air pressure
  • Just a hint of air coming from the vents

Uneven Heating

If you are noticing hot and cold pockets of air throughout your home, it could be due to an issue air flow.

If one room is hot and the next room is cold, that is typically one of the first signs of disrupted air flow in your HVAC unit.

Air Pressure Imbalance

If you have been experiencing things like:

  • Hissing or whistling sounds
  • Breezy or drafty areas in the home
  • Doors seemingly slamming on their own

If this has been happening in your home, don’t worry it’s probably not haunted. More likely it is an imbalance of air pressure in your HVAC system.

Weak Air from Vents

If you can barely feel any air coming out of a vent that is right in front of you, there is probably a blockage in air flow.

What causes an HVAC air flow problem?

A blockage in air flow in your HVAC unit can be caused by a variety of factors.

Some of the most common factors that prevent air from flowing freely, are:

  • Dirty air filter
  • Blocked/shut vent
  • Condenser unit obstruction
  • Duct blockages or leaks
  • Inappropriate model for the space
  • Malfunctioning thermostat
  • Fan problems
  • Condenser coils need cleaning

Air Filter

The air filter is there to prevent dust and dirt from getting into the HVAC unit and the ducts that supply air to your home.

Filters can become clogged with debris and therefore ineffective over time.

Air filters should be changed regularly, the frequency of changes increases if there pets in the home or one of the residents has allergies.

Blocked Vents

You may think you are saving energy by closing a vent in a room you are not in. This does not actually save energy, it just disrupts the balance of air flow from the HVAC unit.

The same effect occurs by blocking a vent with furniture.

Keep vents open and unobstructed for optimal air movement.

Condenser Unit

The condenser unit is the component of your HVAC air conditioner that you will typically see outside. Leaves and dirt can get stuck in the unit, compromising air flow.

Duct Blockages or Leaks

Another common cause of air flow inconsistency is blockages or leaks in the ductwork.

Regular HVAC duct cleaning and maintenance can negate this issue.

Incorrect Model

If your HVAC unit is not properly sized for your space, it can result in inconsistent operation which can disrupt air flow.


Interrupted air flow can also be caused by thermostat issues, like faulty wiring or improper settings.

Fan Motor

If the fan motor is working too hard to try to blow air throughout your space, it may be time for a replacement.

Condenser Coils

Condenser coils are responsible for releasing heat to blow cool air through the ducts. If the coils are dirty, the HVAC unit will have to work harder to dispense air flow.

Air In Motion Heating & Cooling

To ensure you are getting optimal air flow from your HVAC unit, it is highly recommended to have it serviced and maintained by a professional HVAC company.

Air In Motion can assist with all your HVAC heating and cooling needs.

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