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Why Is My Furnace Blowing Cold Air?

Anchor Heating and Air is your #StillLocal heating & air conditioning company serving Charleston, SC and the surrounding areas. 

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Why Is My Furnace Blowing Cold Air?

What is your favorite winter activity to do in Charleston? Some favor escaping the cold weather and snuggling up on the couch, while others enjoy the cold during an off-season beach walk. However, what do you do if you return from a winter activity to your furnace blowing cold air? An Anchor Heating and Air technician can quickly identify and repair the problem, but it is important to remain knowledgeable on your furnace system. In this blog, we discuss potential causes of why your furnace is blowing cold air.

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Much like any heating and cooling system, furnaces require repair from time to time. Furnaces are complex systems and one obstruction can cause the whole system to quit working. Some furnace repairs can be a simple fix, while others require professional help. If your vents are blowing cold air, there could be many causes. Below are five potential reasons your furnace is distributing cold air in West Ashley and surrounding areas.

  • Malfunctioning Thermostat
  • Clogged Condensate Line
  • Dirty Air Filters
  • Pilot Light Issue
  • Low Gas Supply

Malfunctioning Thermostat

As silly as it may seem, double check the status of your thermostat if you are experiencing furnace problems. Someone in your home may have accidentally switched the thermostat setting and caused your furnace to blow cold air. Ensure the thermostat is set to your preferred temperature and on “Heat” mode. Next, confirm the thermostat is set to “Auto” rather than “On.” Thermostats set to “On” cause the furnace to run constantly, whether or not it is generating heat. If both of these settings are correct, the thermostat may need new batteries or is experiencing an internal malfunction.

Clogged Condensate Line

Furnaces not only work to provide heat for your home, but remove moisture as well. Due to the furnace operation process, condensation can form and exit through a drain line. Condensate lines can become clogged from dirty coils or mold growth inside the line. Blocked drain lines can deactivate furnace burners or pilot lights and cause cold air to be distributed into your home. Additionally, clogged condensate lines can cause water leaks and not only damage your furnace, but your home as well. It is best to give one of our trained technicians a call to properly unclog the condensate line and prevent any further issues.

Helpful tip! Your drain line need to be flushed at least twice a year. As a member of the Captain’s Club, you’ll receive annual furnace maintenance which includes flushing your drain line.

Dirty Air Filters

Air filters are one of the most important components of your home’s heating and cooling systems, because the filters catch allergens and increase many aspects of the heating process. Not only do air filters increase air quality, but airflow, comfort, and efficiency as well. If your furnace is not blowing warm air, we recommend checking the status of each air filter in your home. Dirty air filters strain the heating system, because of its inability to push air through the filter pores. An overworked system can lead to a breakdown or the unit shutting off completely, which would be why your vents are distributing cold air. Additionally, it is important to not forget about the furnace filter! Furnace filters are located in the blower compartment and need to be regularly changed with filters around your home.

Pilot Light Issue

Pilot light issues are a common cause of furnaces generating cold air, but our technicians can quickly fix the problem! Pilot lights are a small blue flame that serves as the ignition source for a gas burner. If the pilot light goes out or experiences a malfunction, heat will never be produced. If the pilot light is out, the furnace will circulate cold air until the unit recognizes the issue and shuts down completely. If the pilot light is an orange or yellow, it indicates there is a gas problem. Too much gas can cause health issues and risk your safety, which is why pilot light problems should never be ignored.

Low Gas Supply

Natural gas furnaces are the most common type of furnace. If your home uses a gas furnace, it requires a steady supply of gas to generate heat. Furnace systems are designed to shut off if there is little to no gas, which is why you may experience cold air coming from air vents until the unit shuts off. Interfering with natural gas can pose a threat to your health and safety, and we do not recommend attempting to repair the problem yourself. Our technicians are well-trained in repairing gas furnaces in Summerville, South Carolina!

Being knowledgeable about your furnace can help identify if the furnace repair is a simple or professional fix. If your furnace isn’t blowing warm air, consider these common causes. Let us help you keep your home warm and cozy this winter season with our furnace repair services in Mount Pleasant and surrounding areas.

To learn more about the furnace operation process and types of furnaces, visit our recent blog article “Heat Pumps vs. Furnaces.”

steph and david a7f65258
About The Author

Stephanie Postell

Stephanie is the Co-Owner and COO of Anchor Heating and Air and is a lifelong resident of Charleston, South Carolina. Stephanie and her husband David have over 30 years experience in heating and air conditioning.

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Ray L.
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I HIGHLY RECOMMEND Anchor Heating and Air LLC. Their technician (R. Simmons) was punctual, courteous, extremely knowledgeable about HVAC systems, took problem identification to resolution and did not leave the job until everything was taken care of. The Company Owner (D. Postell) personally came to our home and did a load calculation for our system and presented us with three different options in a well written proposal within two hours. We feel very fortunate that we were able to find such a great HVAC company with incredible customer service skills.
Bernice P.
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really good service—and Doug, their tech man, was just great. He had to work quite awhile to get furnace going and then installed a new thermostat. He patiently explained how to program it.
W G
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Courtney C.
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Great personalized service! Very knowledgeable.
Frank K.
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Nancy B.
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Ron was very professional and knowledgeable and solved a request I had quickly. I much appreciated his work.
Chuck S.
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Your firm did a great jobs and will take our contract to our new house. Solid people and service
Larry Z.
1708208658
Rick was absolutely great to work with when he was here to service our HVAC system. He was very clear and concise when explaining what he was going to do and what was needed to make our system 100% efficient. He took pictures of EVERYTHING he worked on so that we could see and understand what needed to be done. There was no feeling of being rushed. When we next need service, we will call Anchor and request Rick!
Shannon R.
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Doug was a knowledgeable tech who provided a thorough inspection and repair.
Kristin O.
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Everyone is amazing! You can see that the owners care about their employees and the service provided!
Robert M.
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Robert J.
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Courteous, knowledgeable, professional and timely service.
Allen T.
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Juerg G.
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A/C didn’t cool. I called Anchor, they came buy, evaluated the situation, provided suggestions & proposals and after a decision a new complete A/C System was installed with an acceptable time frame … GREAT JOB
Doug J.
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Great company living by their values! 5 stars just isn't enough. If you use Anchor, you don't be sorry!!!
Jamie D.
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I highly recommend Anchor Heating and Air. They are an honest and reliable company. The owners Dave and Stephanie are constantly finding ways to give back to the community. I recommend them to friends and neighbors every chance I get. We have an older HVAC system and have needed occasional repairs. Anchor has always provided us with affordable pricing as well as top notch service. We also utilize their subscription program for twice yearly maintenance. We have never felt pressured to replace our system even though it’s older. When the time comes we plan to use Anchor.
Brianna M.
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If you’re looking for a family owned and operated company that truly cares about you, call Anchor!
Maynor G.
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"Incredible service from Anchor Heating and Cooling! From the first contact to job completion, I was impressed by their professionalism and attention to detail. The staff was punctual, friendly, and knowledgeable, resolving my issue quickly and efficiently. I wouldn't hesitate to recommend Anchor Heating and Cooling to friends and family. They definitely deserve five stars for their excellent service!"
Zachary H.
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Kyla W.
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Amazing service, prompt, efficient and very thorough. Would highly recommend Anchor
Brandon M.
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Stephanie and David are two of the most selfless people you could ever meet! They aren’t building a business… they are building a culture! Somewhere that customers and tradesmen/women look for and up to. Blessed that our paths crossed and will continue to be one of their biggest supporters!
Bradley T.
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Great company with great owners and great people all around. 5 stars!!
Mary J.
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Amazing company! They definitely take pride in caring for you as family! I will be suggesting them to everyone in the area!!
Audrey C.
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We just had our air conditioner yearly cleaning done by Brian Hardee from Anchor Heating and Air Conditioning. He did an excellent job assessing our old unit and cleaning it up nicely. Anchor hires the nicest and thorough people. Very satisfied for 3rd year of service. You hire the best people! Thanks to Brian and Rick!
Robert V.
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Doug explained the issues clearly
Paul F.
1707059114
Great customer service and a detailed inspection by an informative and eager technician. Coordination and head’s up info via text messaging was really helpful as well.
William G.
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So glad we hooked up with these guys for our service and repair needs. Fair prices and good honest work. Refreshing to still have that in today's world.
Ryan M.
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Amazing service and very responsive. They are always extremely prompt and responsive over the phone. All technicians and service providers are polite as well as quick to fix any issues you have. Best A/C company I have worked with in Charleston.
tisha L.
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Ron was very professional and thourough - an asset to your company!!
Hank G.
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Cullen came to our house and did a great job of servicing our equipment. He was knowledgeable, and answered all of our questions very professionally.
Benjamin S.
1706663111
Anchor Heating and Air was fantastic. Our technician Cullen was excellent. He was on time, polite, knowledgeable and very thorough. It was a great experience and we highly recommend them. I appreciated how much detail he shared following his inspection and assessment. Company is very easy to deal with and scheduling was simple
Al E.
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Ron did a great job. Very professional and thorough
Eric P.
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Knowledgeable and informative. Helpful in every way.
Pam C.
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Donald H.
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Jack and Ryan did an excellent job, discovering a few issues we had and conducting a dryer vent cleaning. We are very satisfied with the work they accomplished and the diagnosis of our HVAC issues.
Diane C.
1706540143
The office staff is extremely accommodating even though I messed up my appointment. Doug, the service technician, was on time, courteous, helpful especially offering to replace the air filter. He offered options for improving my system in a non aggressive manner. Couldn’t be more pleased with current experiences with Anchor Heating and Air.
Robert C.
1706535193
Excellent Service… Knowledgable… highly Reccommend
David M.
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Excellent job following up shoddy work by Green Dot!
Barry S.
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Very professional.
Ronnie G.
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Very knowledgeable and professional
William G.
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Excellent service and communication
JoAnn B.
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What a great job! Rick arrived on time, worked quickly & efficiently. He was so courteous & patient with my questions; he explained everything to me so clearly. I highly recommend Anchor Heating & Air and Rick Sinclair!
montgomery B.
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Jennifer C
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Anchor is a great local company for your heating and air needs. Everyone I have encountered from Anchor has been on time, knowledgeable and helpful. Rick was very kind to help me reset my thermostat set up since I entered incorrect info and saved down too quickly.
joe G.
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Very knowledgeable and professional person!
Gerrie M.
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Cullen was prompt, thorough, and knowledgeable. He explained every thing perfectly and was extremely personable.
Carol C.
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Although I could not be present when my scheduled maintenance was performed I was totally impressed with the service I received. Rick was on time, very polite on the phone, and based on the time he was at my residence I have to say very thorough in the work performed. He called to explain his findings and even provided photos. I look forward to continuing my relationship with your company!
Chris D.
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Great company, we are using them for our Kiawah rental. They are very responsive and good at keeping us updated on when they are coming out to the house.
Judith T.
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Anchor bought out the previous HVAC company that we had a contract with, Green Dot. I called to schedule the winter inspection of my system thinking that I was calling Green Dot. Was told that Anchor bought Green Dot and that they would honor the by yearly inspection maintenance contract I already paid for. Disappointed that Green Dot didn’t notify their customers of the buy out. Scheduled with Anchor and they were 5 star. Was given a 2 hour window for technician arrival, was text when they were on the way. My technician Jordon arrived on time, put shoe covers on his feet, was polite, friendly and did a thorough job of servicing our system. He also took pictures of the components of our system and suggested things we may want to address during the next spring visit. I highly recommend Anchor and hope that Jordan is our tech in the spring.
karl B.
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Great service, prompt , reliable, and very responsive. Techs are very professional, polite, knowledgeable and very helpful.If you need an HVAC contractor/ technician, I highly recommend the team at Anchor.
Patti B.
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Paul G.
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Doug was extremely helpful, knowledgeable, and professional.
Sam R.
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A sincerely professional & personable business - we look forward to hiring them for all of our AC/Heating needs for the definite future.
K. Sharon B.
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The technician was great and diagnosed the problem in short order. Pleased to have competent pleasant repair service and will use them in the future
Mia B.
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Thoroughly helpful, honest and respectful!!
Derek B.
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Cullen provided fantastic service, was transparent and provided solid guidance.
Alexis B.
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Amber N.
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Shout out to Jack and Ryan for their professionalism, honesty, knowledge.....we already scheduled for our duct cleaning next week. Thx Anchor!!! John and Joy
Anna
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This was a great experience using Anchor. They are fabulous! I have been a landlord forever so I appreciate greatly how professional, friendly and on time they were. This was a tricky downtown Charleston installation high up on a roof and they were perfect.
E N.
1704221019
I came home after the holidays to no heat. One call to Anchor and Rick met me at the house that afternoon and had the unit up and running in no time. The entire team was kind, courteous and knowledgeable. A really pleasant experience!
Martin G.
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Prompt. Polite. Detailed and thorough. .
Nancy W.
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The best service ever responded right away and very compassionate toward the client. More companies should be like this company
Rick E.
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Very responsive, thorough and friendly
pabcoaching P.
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Outstanding workmanship. Dependable, Skilled, Timely, Great Work Ethic.
Shelli V.
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Cullen was thorough, professional, on time and knowledgeable
Jim C.
1701130896
Called Anchor when 10 year old air conditioner went out. They responded quickly and found the problem. They presented me repair and replacement options. I optied for a new system, and scheduled an installation date. They arrived on time, and quickly installed the new system. I found both Anchor's office staff and technicians to be knowlegable, professional and extremely courteous. I can highly recommend them.
Craig D.
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I called on Anchor a few times last year and they were always attentive, flexible and professional. I'd say they are my go-to at this point.
jack F.
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FRENDLY AND VERY THOROUGH SERVICE
Tim P.
1700920568
Anchor Heating and Air's Technician Cullen Rahman was delayed due to high traffic, but call before the appointed time to inform us, which is not usual with other companies.Cullen was polite, knowledgeable and efficient. Even though is was raining, he maintained a very professional attitude and completed the task efficiently.I would highly recommend Anchor Heating and Air for all your HVAC needs.
OJ G.
1700670335
I received excellent service. It is refreshing to find a company that does not recommend unnecessary repairs.
Carrie T.
1700665842
Exceptional service!
Jerry W.
1700660425
If I could give more than 5 stars, I would! You start off with owners who care about their customers, community, and employees. You mix in their employees who take the time to explain everything they're doing and to actually do the job thoroughly without cutting corners. And then, to constantly give back to the community...This is the recipe for success! You can't go wrong with selecting Anchor for all your HVAC needs!
Meredith R.
1700658495
Amazing service, excellent communication once we made our initial call for service, detailed report of everything that needed to be done to fix our problem, service with a smile always and extremely punctual, highly recommended!
Seth D.
1693241450
Cullen Rahman was extraordinary. Highly recommended.Seth
Ericand K.
1692021922
Anchor Heating and Air is the best!! We have a summer home down in the Daniel Island area, and they provide all of the maintenance for our heating and air conditioning system. No matter what time of year it is, our system works great, and their team is such a joy to work with! I highly recommend them for all of your AC maintenance needs.
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