Common Reasons For Furnace Airflow Issues

Tori Klein • November 17, 2022

Problems with the airflow in your furnace are among the most frustrating problems you might have.

Picture of a woman sitting next to a window.

You could think everything is fine if your furnace turns on and starts up as it should, but if your home doesn't warm up, you might have an airflow problem.


Here's what you can do if your furnace turns out to be that way:

  1. Check the Thermostat - The thermostat should be the first item you look at. Despite the ease with which this issue can be resolved, it is much more widespread than you might think. The thermostat is stuck in the cooling setting, dead batteries, and the fan is set to "on" are all pervasive problems. It's okay to give us a ring and seek guidance if you feel lost or unsure of what to do.
  2. Check the Air Filter - You can have a too-efficient air filter, or your air filter could be unclean. When an air filter gets dirty, it might become clogged, preventing enough air from passing through the system. A dirty air filter can cause damage to your furnace, so it's crucial to replace it at least once every few months. On the other hand, the filter you purchased might be too efficient for your setup. The purpose of an air filter is to trap debris like dust and dirt before they may contaminate your equipment. A higher-quality filter will block even the tiniest particles but may also reduce airflow.
  3. Have the Ducts Inspected - Maybe the issue isn't with the furnace at all. It's possible that the ducts, which distribute hot air throughout the house, are at fault. It's not uncommon for ducts to experience airflow problems due to factors such as tears. A certain amount of air pressure is needed in the ducts for the air to be able to flow through the system. Reduced air pressure and flow rate result from a tear in flexible duct material. You won't have to worry as much about tears in metal ducting, but complete disconnects are a different story. If the sealants loosen or are knocked loose by someone working in the attic, this results. Insulation or other debris falling from the ceiling can also obstruct airflow.
  4. Check the Blower - A blower is a fan that circulates hot air through a ventilation system. The air has nowhere to go if the fan isn't running. That can certainly lead to ventilation problems, making it seem like your heater is broken. The blower is just a motor attached to a fan. That motor can overheat for several reasons, including age, a lack of maintenance, or the presence of debris. This is, fortunately, an easily replaceable component.
  5. Consider replacement - You may consider getting a new furnace if none of those things work. Older furnaces may not be as efficient as they say they are, which could cause less air to flow through them. However, the age of the system, among other things, can affect whether that is the case.


If you think you need a replacement or any other HVAC service; we are happy to talk with you about it.

Need someone to clear the air on your airflow issues? Contact Best Owner Direct HVAC today to schedule a service.

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