Male Goettl technician in attic replacing heating vent

Causes of Low Air Flow in Your Furnace

Furnaces are “forced-air” systems: they distribute the heat created in the furnace’s cabinet through ductwork using an air handler. Your furnace’s burners, gas jets, heating elements, and heat exchangers can work perfectly—but without proper airflow, the heat they generate will not reach you. When you discover low airflow coming from your house’s vents, it points toward a possibly serious problem with the furnace.

There are a number of potential causes for a drop in furnace airflow. The list below will give you some diagnostic help discovering what may be causing the problem.

3 Possible Causes of Reduced Airflow From a Furnace

  1. Clogged air filter: The air filter installed in the furnace’s intake prevents debris from entering the cabinet. It needs to be changed once a month during the height of the heating season, or else the filter will become clogged with dust and dirt and begin to choke off the airflow into the furnace. (A clogged filter can cause other trouble as well, so make sure you have it changed on schedule.)
  2. Breaks in the ductwork: The sealed ductwork maintains the pressure of the air as it travels from the furnace to the vents. If breaks or gaps appear in the ducts, they will cause the air to escape and air pressure to drop. This will also allow an infiltration of dust into the ducts and a loss of heat. If you notice a musty odor along with the reduced airflow, then duct breaks are a probable cause. You will need professional duct repair and sealing.
  3. Broken air handler: The air handler of the furnace contains the blower and motors that send the air through the furnace for heat exchange and then into the ventilation system. Damaged or broken motors, bent fan blades, cracked fan belts, and electrical faults can all contribute to an air handler than can’t work at its regular level. The components will need repairs, or the whole air handler may require replacement.

Furnaces Need Professional Repairs

Changing the air filter is something you can take care of on your own, but for any other issues with airflow, you should call professionals to look into the problem and find the best way to remedy it. If changing the filter doesn’t restore your airflow, get on the phone and call Goettl for excellent heating repair.

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Gonzalo CastilloGonzalo Castillo
17:20 13 Jul 24
Peter is very experienced and professional. He knows a lot and explains everything in detail.
John McCarreyJohn McCarrey
13:56 13 Jul 24
Excellent service!
Gary StapletonGary Stapleton
02:37 13 Jul 24
I called Goettl to get a second opinion on a/c repair options or replacement. Peter Medelez conducted a very thorough system check and confirmed all the same issues previously identified but found an additional issue; tipping the scale to full replacement. We appreciated his professionalism and knowledge: answering all our questions and explaining the issues and options. We ultimately chose Goettl for the replacement option due to their price and professionalism.
James KroppJames Kropp
17:19 09 Jul 24
It was great
Robert WilliamsRobert Williams
17:06 09 Jul 24
Peter was great! Explained every detail I needed and answered all my questions!
Gustavo EscobarGustavo Escobar
16:57 09 Jul 24
Jesus Gloria provided exceptional service as the Goettl Technician this past weekend. He demonstrated great attention to detail in addressing the issues with our air conditioning unit and resolved them quickly, within 30 minutes. Jesus has a strong dedication to his profession and the company he represents, as evidenced by his professional demeanor and the quality of his work. His customer service skills are top-notch, earning a 5-star rating from us. We were so impressed by his service that we have decided to become members of the Goettl service.
Jesse Vann, JrJesse Vann, Jr
15:19 09 Jul 24
Jehad and Cameron provided great recommendation and customer service for my AC replacement.
Reda MoxleyReda Moxley
15:08 09 Jul 24
markdruthmarkdruth
17:04 01 Jul 24
Got exactly what we needed with the service and had great customer service from Tyler for our plumbing and with Jehad for our AC work. They were awesome! Thanks!
Donna OwensDonna Owens
15:51 01 Jul 24
Rudy came out and was very professional and addressed our plumbing needs in a timely manner, highly recommended.
Neuro NerdNeuro Nerd
15:06 01 Jul 24
William and Cameron were knowledgeable, friendly, professional, respectful and put on plastic booties over their shoes when they came into the house. Our pets were comfortable with them and that says a lot. We will definitely ask for them again in the future if our AC has any issues.
Karen PardoKaren Pardo
14:55 01 Jul 24
Jehad did an amazing job after checking the entire unit he came down and thoroughly explained everything that needed to get done/replace.
Kelly MoserKelly Moser
17:01 27 Jun 24
Matthew was on time respectful and very curious. He explained everything I needed to know and I felt no pressure to buy additional things. Thank you Matt .
Dusengimana ErnestDusengimana Ernest
15:49 27 Jun 24
Jesus gloria did great. Wonderful
Nick LoprzNick Loprz
14:39 27 Jun 24
Charles JeterCharles Jeter
22:12 26 Jun 24
Kimberly FordKimberly Ford
21:34 26 Jun 24
EXCELLENT CUSTOMER SERVICE!! Jesus Gloria provided AC maintenance today providing with photos and video of his findings and a thorough explanation of any issues found. Richard Wenzlaff and Junior also came out today for the plumbing maintenance and also provided EXCELLENT CUSTOMER SERVICE. I have very clean water. They checked out my water heaters, water softener, osmosis, etc…no issues were noted! Three AWESOME, hard-working, thorough gentleman! Professional and courteous! Thanks guys! Appreciate your hard work and honesty!
Music by JuanMusic by Juan
17:47 19 Jun 24
Supreme service.
Erica RussellErica Russell
17:16 19 Jun 24
Awesome experience. Jesus Gloria was very friendly and informative and solved the problem quickly.
AudreyAudrey
16:06 19 Jun 24
Josh was amazing! He was personable, polite, professional, and he walked me through everything he was doing and looking at. If I could give him ten stars I would!
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