Should You Be Concerned About Low Airflow from Your Furnace?

Dependable Service Since 1926

The short answer to this is, “yes,” but we don’t expect you to accept that at face value. We want you to know why this is occurring, what you may be able to do about it on your own, and when it’s time to call in a pro for expert furnace repairs in Denver, CO.

If your furnace or heat pump isn’t blowing warm air like it used to, it’s likely you have an airflow problem. There are many potential causes for this, but the last thing you should do is waste time making assumptions. Whether it’s your furnace or your air conditioner, low airflow problems are a pain and can be major red flags for a bigger breakdown later on. Keep reading for some common causes of low airflow so you know what to expect when we come out, then give our team a call!

Dirty/Clogged Air Filter

When is the last time you checked your air filter? Do this first, before making a repair call. Replacing a dirty air filter can actually solve several HVAC problems.

Without a clean air filter in place, your system’s airflow will be blocked. Additionally, it forces your furnace to work harder than it should have to. Generally speaking, your air filter should be changed every 1-3 months depending on the type and level of contaminants in your home.

Frozen Evaporator Coil

So what if you’re using a heat pump instead of a furnace? Well, your low flow issues could be due to a frozen evaporator coil. What happens is when it gets too cold, the condensation freezes. If it’s summertime, you may mistake this as a good sign that your heat pump is doing its job while its in cooling mode, but this isn’t ever something you want to see.

In many cases, a frozen evaporator coil can actually be caused by a dirty air filter restricting airflow. So again, you should check your air filter! But regardless of what’s causing the frozen evaporator coil, it’s important that you not try to remove the ice yourself, as you can end up doing more harm than good to the system, and it doesn’t solve whatever the source of the problem is.

Ductwork Issues

The air ducts of your furnace or heat pump are responsible for transferring conditioned air throughout your living space. If they aren’t in good shape, you’ll likely feel cold spots or weak airflow.

A common reason for air duct problems is leaks. This may be due to a disconnect that came from poor installation, or it can even be from tears and holes in the ductwork that have happened over the years due to wear.


Short-cycling is the name given to the process where your furnace or heat pump cycles on and off rapidly, instead of in regular intervals 2-3 times an hour. A number of things can cause this. For instance if your system is brand new, it means that it is—unfortunately—too large for your home. But this isn’t the only cause. The best thing you can do if you notice your heater short-cycling is to give our pros a call ASAP!

Get peace of mind by calling Bell Plumbing and Heating, the company metro area homeowners have been trusting for over 90 years!

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