Why does my air conditioning vent have low airflow? Pippin Brothers Lawton, OK
January 21, 2015

So, you turned on your heating/cooling system, and you noticed something strange: one of your rooms isn't heating/cooling properly.

To your dismay, you noticed that there's little to no air coming out of the supply air vent!

You check the other rooms and they're getting air just fine. But that one room just has bad luck.

So, what's wrong with that one room?

Here are few issues with the ductwork that can cause this frustrating problem.

4 common causes of a single air vent with little to no air

Kinked/crushed flex duct.
Flex duct is, as it sounds, ductwork that's very flexible. However, because it's so flexible, it's easily bent and crushed, which restricts airflow to a particular room.

If you have flex ductwork in the in the attic, check to see if anything is pinching or crushing it.

Disconnected air duct.
Both metal sheet ductwork and flex ductwork can get disconnected, preventing any air from your heating/cooling system from reaching the room.

You'll need a professional to locate the disconnected duct and seal it so that no air escapes.

Leaky/holey air ducts.
If you've got just a little air coming through the vent, the ductwork leading to the room may be leaky or full of holes.

This problem is actually pretty common. According to ENERGY STAR, "In a typical house, however, about 20 to 30 percent of the air that moves through the duct system is lost due to leaks, holes, and poorly connected ducts."

The solution? Duct sealing.

Closed damper.
Dampers are valves in your ducts that control airflow in your air duct system. When open, air flows freely; when closed (or almost shut) there's little or no airflow.

You may have a closed damper that's blocking air from reaching your one room.

Other possible issues

Occasionally something else could be creating blockage (e.g. an animal that breached duct and made nest or died, kids' stuffed toys, someone hides something in a floor duct, etc.). Furniture blocking air vents is also a common problem.

Remove the item causing the blockage or rearrange furniture for optimal airflow.

How Pippin Brothers can help

A visual inspection
If you live in the Lawton, OK area, Pippin Brothers can quickly find where the problem lies in your duct system by performing a visual inspection. This is the quickest and least expensive method for investigating your duct system.

High resolution imaging and thermal scanning
If the visual inspection yielded limited or no information (which is common if ducts are concealed and not accessible), we can insert a high-resolution imaging camera to see crushed, broken, blocked and/or dirty ducts on a video monitor.

A thermal scan may show blocked heat/cooling or an area of leakage or a broken duct. The camera detects heat patterns and changes in the temperature of your duct system. These readings allow our technicians to locate problems and can potentially prevent a potential system failure and save you money on costly repairs and downtime.

Non-invasive process
Seldom does no/low airflow require invasive measures such as cutting holes in drywall and patching. But when we do have to open a small area of a wall or ceiling to access the problem, we have skilled craftsmen that can repair the opening and make it like it new.

Have you always had no/low airflow?

This blog post assumes that your ducts had always good airflow and then one day you have no/low airflow from a duct.

But If parts of your home have always had no/low airflow and have not been comfortable, it's usually the result of an inadequate duct system installation when the house was built or the equipment replaced. We can test the performance of your duct system to determine how effectively and efficiently it is working and if it is limiting your comfort, equipment performance, and impacting your energy bills regardless of the age of your equipment.

Schedule a visit today.

Pippin Brothers is the Lawton-area's most trusted heating, air conditioning and plumbing company. We've been serving Oklahoma since 1978. Contact us for more information.