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Cool Touch Air Conditioning and Heating Blog

Low Air Flow Problems in Heaters Explained

inside-furnaceNothing is more irritating than a heater that just isn’t blowing hot air. The heater could be blowing room temperature air, or maybe it doesn’t seem to be blowing air at all. We understand the frustration. After all, blowing hot air is the one thing it’s supposed to do right!

Along with your airflow woes, the heater may not be displaying any particular symptoms that could help you pinpoint the source of the problem. That just makes it harder to understand why it’s happening at all.

We can’t tell you what the problem is for sure without being there, so the least we can do is tell you about some of the most common issues.


Furnaces are the most common heaters in the nation. Statistically speaking, you own or have owned one in the past.

Fixing air flow issues is especially important with gas furnaces. Gas furnaces very rarely ever have any problems as long as they stay in proper working condition. If there are any airflow issues, it could lead to overheating and even fires or carbon monoxide leaks, so do make sure to call an expert of furnace services in Phoenix immediately if that’s the case.

That being said, here are some potential reasons your furnace will have airflow issues:

  • Air filter: One of the most common issues with furnaces is neglecting to change a dirty air filter. The air filter must be changed regularly in order to keep air flowing at a normal rate.
  • Damaged or obstructed ducts: The ducts transfer air through your home, and that alone makes up half your HVAC system. If these ducts have leaks or obstructions within them, they will affect airflow.
  • Improperly sized ducts or vents: Ducts and vents that are too big or too small for your system can also be a problem for airflow. This is common if you’ve upgraded your heater but not the ducts themselves.
  • Broken blower: The blower is the fan that blows heated air through the ducts. If the blower is broken, that air will not have any momentum, and you won’t feel it coming out the other end.

Heat Pumps

Heat pumps are unique in that they can act as both air conditioners or as highly efficient heaters. However, they don’t use gas combustion or electrical resistance to generate heat. Instead, they use refrigerant and a heat transfer cycle. This comes with its own possible problems that can manifest as airflow issues.

  • Defrost cycle: If the heat pump’s outdoor unit has developed frost, it will go through a defrost cycle. The heat pump may release cold air into your home during this brief period.
  • Refrigerant leak: A leak in the refrigerant line can compromise the heat pump’s performance, such as being unable to properly create heated air.
  • Frozen evaporator coil: Likewise, a refrigerant leak can cause the evaporator coil to freeze over, and that can create airflow issues.
  • Duct issues: If your heat pump is the kind that uses ducts, it can suffer from the same duct problems listed above.

Need someone to help you find the solution to your heater problems? Contact Cool Touch Air Conditioning and Heating today to schedule a service.

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