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Why Does My Nose Get Stuffy When the Heater Runs?

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When winter temperatures drop and heaters fire up, many people notice an unexpected side effect: a stuffy nose. If you’ve ever wondered why your nasal passages feel clogged the moment your furnace kicks on, you’re not alone. At Thomas Hoffmann Air Conditioning & Heating, we frequently hear this question from St. Louis homeowners. Let’s break down the reasons behind this all-too-common experience — and what you can do to fix it.

stuffy nose
Zach worked fast and answered all my questions with ease.
Thomas Hoffman replaced my water heater. They were effective, efficient and pleasant people with whom to work.
Nick was a true expert in explaining our options for a new thermostat.
Response from the owner:Thank you, Robert, for your kind words about Nick's expertise; we're glad he could help you with your thermostat options!
Responsive! Came over, even after hours to help resolve a critical issue that was caused by a lightning strike causing a gas leak. Would highly recommend!!
Response from the owner:Thank you for your kind words! We're glad our team was able to assist you promptly, especially during such a critical situation. Your recommendation means a lot to us!
Having Tom come to our aid was a great experience and he offered followup assistance with the fancy technology part of the appliance if we need it. We will call him again if the need arises. Merry Christmas.
Response from the owner:Thank you, Marilyn! We're glad to hear that Nick was able to assist you and provide follow-up support. We appreciate your trust in us and wish you a Merry Christmas!
They got the job done, we're very quick and very kind!
Response from the owner:Thank you for your kind words! We appreciate your feedback and are glad we could assist you efficiently.
Great service. Responsive. Well trained technicians. Honest friendly and thorough. I highly recommend Tom Hoffmann and his team.
Response from the owner:Thank you for your kind words! We appreciate your recommendation and are delighted to hear about your positive experience with our team.
As always, the Hoffmann technician was polite, professional, and efficient. Pricing is reasonable and even more importantly, they are dependable. I will continue to use Thomas Hoffman A/C and Heating.
Response from the owner:Thank you, Mark, for your kind words about our technician and for your continued trust in Thomas Hoffman A/C and Heating; we truly appreciate your support!
These guys are pros.
Techs are friendly, listen and explain what they are doing.
Office staff is responsive.
Fast service....
Response from the owner:Thank you, Clark, for your kind words! We're glad to hear our techs and office staff made your experience a great one. Your feedback means a lot to us!
Excellent service. A/C went out on a weekend. Called them on Saturday morning, they were out within about 2 hours. The fix was easy enough, and he even had the part in the truck! I recommend this company for all of your HVAC needs
Response from the owner:Thank you, Elaine! We're glad to hear you received prompt service and that the fix was smooth. Your recommendation means a lot to us!
The service technicians are very courteous and communicate well with the customer. They let you know what, if any, problems are found, the options, and the cost of the repair(s). Quick and efficient.
Response from the owner:Thank you for recognizing our service technicians' courteous and effective communication, we appreciate your feedback!
These guys were great. Quick to return my call. Up front pricing. Great work on the installation. And the installers were nice and friendly. Highly recommend Thomas Hoffmann.
Response from the owner:Thank you, Steve! We truly appreciate your kind words and are glad to hear you had such a positive experience with our team and Thomas Hoffmann. Your recommendation means a lot to us!
Hoffmann came out the same day I called them because our AC was out. The technician, Ryan, was able to get the system running again, was polite and responded to my questions. We’re off to a good start!
Response from the owner:Thank you, John! We're glad to hear Ryan was able to help and that you’re off to a good start with your AC. We appreciate your feedback!
Thomas came over promptly I spoke with him about my concerns with my unit. Immediately got to work trouble shooting and resolved my issues. A+
Response from the owner:Thank you, James, for your kind words and for recognizing Thomas's promptness and dedication in resolving your concerns; we appreciate your feedback!
We have called Thomas Hoffmann many times and they are very prompt and very professional.
Response from the owner:Thank you, Vicki, for your kind words about Thomas Hoffmann's promptness and professionalism; we truly appreciate your feedback!
Super friendly, helpful, and quick to make the fix.
Response from the owner:Thank you, Jack! We're glad to hear you found our service friendly and efficient; your feedback means a lot to us!
Not a customer, but witnessed one of their technicians have an episode of road rage in Clayton. I would be concerned about letting them into my house/business.
We really trust Thomas Hoffman AC and Heating. Nick Hoffman has serviced our units several times now and he is professional, knowledgeable and very easy to work with. He comes on time, so we don’t have to schedule a long waiting period. We would highly recommend this company.
Response from the owner:Thank you, Greg, for your kind words and for trusting us with your AC and heating needs; we’re glad to hear that Nick has provided you with such great service.
We’ve been looking for a locally owned small HVAC dealer for a few years. And we found it with Thomas Hoffmann Air Conditioning & Heating. We love their service technicians. They come on time, they know what they are doing, they don’t upsell you on every appointment and they like working for Thomas Hoffmann. A happy employee makes for a happy customer.
Response from the owner:Thank you, Mary, for sharing your wonderful experience with us; we're glad to hear you appreciate our technicians and their commitment to great service!
I called on a Monday morning as air conditioning was blowing warm air. They were able to come to my house very early afternoon and fixed the problem. Would highly recommend and will use them again.
Response from the owner:Becky thank you so much for your great review. We appreciate your business and your kind words.
quick to arrive and fast service
Response from the owner:Thank you, Connie, for your kind words about our quick arrival and fast service; we appreciate your feedback!
Very good, pleased with service.
Response from the owner:Thank you! We're glad to hear you were pleased with our service and appreciate your kind words.
Excellent service from Nick!
Response from the owner:Thank you, Margaret! We appreciate your kind words and will make sure to pass along your praise to Nick for his excellent service.
I am very pleased with the service provided.
, especially the quick response to my request . The technician came in themorning and had my cooling system repaired within an hour. Thank you !
Response from the owner:We're delighted we could promptly assist you on a Sunday morning and fix your cooling system efficiently. Thank you!
Here on time, worked fast. Always pleasant and great answering questions. Zach always does a great job.
Response from the owner:Thank you, Debra, for your kind words; we're glad to hear Zach made a positive impression and that you had a great experience with our team!
great job
Response from the owner:Thank you, Joe! We appreciate your kind words and the support from everyone involved.
Extremely quick response for appointment and did quick fix for our furnace and heat is working great !
Response from the owner:Thank you for your kind words! We're glad to hear our team was able to respond quickly and get your furnace working great. We appreciate your feedback!
They were timely, polite, professional and they saved us from too much sweating. In a field full of pompous and arrogant technicians, these guys take the time to explain what is wrong and how they are correcting it. Other folks just assume you are incompetent but these folks take the time to educate. Cannot recommend highly enough.
Response from the owner:Thank you for your kind words! We truly appreciate your feedback and are glad we could provide you with a positive experience.
Great service and arrived on time when promised.
Response from the owner:Thank you Wray, for your kind words! We're glad to hear you had a great experience and that everything was on time.
I would like to have a receipt for my payment which I did not receive. On a positive note he was very punctual very early actually he did his job and was very professional and I'm hoping and praying this took care of the issue thank you and I would not hesitate at this time to use your services
Response from the owner:Thank you, Mark, for your feedback and for highlighting the punctuality and professionalism of our team; we appreciate your support and will ensure you receive your receipt promptly.
Our experience with them was fantastic all the way through! Not only were they able to get to our business that day but the customer service from the phone call to the on-site service was professional and quick. We'll definitely be using Thomas Hoffmann Air Conditioning and Heating in the future.
Response from the owner:Thank you, Michelle, for your wonderful feedback! We're glad to hear about your fantastic experience and appreciate your kind words about our team's professionalism. We look forward to serving you again in the future!
Zachary was here on the dot at 8:00am. Thank for making me the first stop as promised. Very friendly too.
Response from the owner:Thank you for recognizing our professionalism and friendliness!
Competence and knowledge have been my experience.
Response from the owner:Thank you, Beth, for sharing your experience; it means a lot to us!
I couldn’t be happier with the service from Thomas Hoffmann Air-Conditioning! From the moment I called, the team was professional, responsive, and truly knowledgeable. Thomas personally made sure everything was handled with great attention to detail. The installation was smooth, efficient, and the quality of the work exceeded my expectations. It’s rare to find a company that is both skilled and genuinely cares about their customers. I highly recommend Thomas Hoffmann Air-Conditioning to anyone looking for honest, reliable, and top-notch service. They’ve definitely earned a loyal customer!
Response from the owner:Thank you, Rick, for your kind words and for recognizing our team's hard work; we're grateful for your support and thrilled to have earned your loyalty!
Amazing service from Thomas Hoffmann! They made space in their schedule to come out the next day to fix our air conditioner. They were on time, honest and fixed the problem on the spot. Thank you!
Response from the owner:Thank you, Ashley! We appreciate your kind words about our team's service – it's great to hear we could help you so quickly.
Excellent Service!
Response from the owner:Thank you, Lynda, for your kind words about our service; we truly appreciate your support!
Fast efficient service. Both of the gentlemen that came to my home were very help and informative not to mention polite. It’s difficult to get service advisers to appear at your home when scheduled most times they’re late or don’t show up at all. Not an issue with this team on time, clear diagnosis, quick repair. I would definitely use Thomas Hoffmann Air Conditioning again. I recommend them highly.
Response from the owner:Thank you, Anna, for your wonderful feedback! We're glad to hear that our team provided you with timely and helpful service, and we appreciate your high recommendation.
Tom was great. Super quick and easy! Serviced my unit in under 24 hours.
Response from the owner:Thank you, Olivia! We appreciate your kind words about Tom and are glad to hear your unit was serviced so quickly.
I have complete trust in Thomas Hoffman AC . I have had multiple
technicians who are always polite and knowledgeable.
Response from the owner:Thank you for your trust in our team, Henry! We appreciate your kind words about our technicians.
The OG brother, Thomas Hoffmann, his son Nick, who and the entire team are fantastic! They have my highest respect and recommendation!
Response from the owner:Thank you, Jane! We truly appreciate your kind words about Thomas, Nick, and the entire team; your support means a lot to us!
Fast response and great quality work.
Response from the owner:Thank you for your kind words about our fast response and quality work; we truly appreciate your support!
Very quick and efficient
Response from the owner:Thank you, for your kind words; we appreciate your recognition of our quick and efficient service!
He got my ac up in running in no time.
Response from the owner:Thank you, T! We're glad to hear that everything is running smoothly and appreciate your recognition of our team's effort.

Dry Air is the Biggest Culprit

Heated indoor air is notoriously dry. As your heating system warms your home, it often reduces the humidity to levels far below what’s comfortable for your body. The dry air strips moisture from your nasal passages, causing them to dry out, become irritated, and swell slightly, leading to that classic “stuffy” sensation.

Ideal indoor humidity levels range from 30% to 50%. Anything lower can make breathing uncomfortable and even contribute to nosebleeds.

Dust, Dander, and Allergens in the Air

When your HVAC system turns on, it circulates air throughout your home, and with it, any dust, pet dander, or other allergens that may be lurking in your ducts or filters. If your system hasn’t been cleaned or maintained recently, you’re essentially breathing in irritants every time the heat runs, which can inflame your nasal passages.

Solution: Regularly replace your HVAC filters (every 1-3 months, depending on your home’s usage) and consider investing in high-quality HEPA filters or air purification systems to reduce airborne particles.

Mold and Mildew Exposure

Although less common, if your HVAC system harbors moisture or has poor ventilation, mold or mildew can develop inside ductwork or around coils. Mold spores are potent allergens and can trigger nasal congestion, sneezing, and other respiratory symptoms.

Red Flag: If your stuffy nose is accompanied by a musty smell when the heater is running, it’s time for a professional HVAC inspection.

Mold in AC system

Sensitivity to Temperature Changes

Some people’s sinuses are sensitive to rapid changes in temperature. Breathing in warm air after exposure to cold air outside can cause the blood vessels in the nose to expand, leading to congestion. This is a natural reaction, but it can feel uncomfortable when it happens repeatedly.

Tip: Gradually warm up your living spaces when possible. Consider wearing a scarf over your nose when transitioning from outdoors to indoors in winter.

How to Breathe Easier This Winter

At Thomas Hoffmann Air Conditioning & Heating, we believe a comfortable home is a healthy home. Here are our top recommendations for reducing winter stuffiness:

  • Add moisture: Install a whole-home humidifier or use portable humidifiers.
  • Keep it clean: Replace air filters regularly and schedule annual HVAC maintenance.
  • Purify the air: Consider air scrubbers, UV lights, or HEPA filtration systems.
  • Ventilate properly: Ensure your home has adequate ventilation to avoid stale air buildup.

We’re Here to Help

If your heater is making you uncomfortable, it’s time to call in the experts. Our locally owned team specializes in HVAC solutions that improve both comfort and air quality across the St. Louis metro area. From humidifier installations to indoor air quality assessments, Thomas Hoffmann Air Conditioning & Heating has you covered.

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