Get expert answers to the top HVAC questions St. Louis homeowners ask. From AC repair to efficiency tips—Thomas Hoffmann has you covered.
At Thomas Hoffmann Air Conditioning & Heating, we receive many great questions from St. Louis homeowners, especially during the peak of summer and winter when your HVAC system is working its hardest. Whether you’re dealing with an old AC unit, rising energy bills, or concerns about air quality, we’ve heard it all—and we’re here to help.
Zac did our service today. A very professional and courteous young man.
He did a thorough inspection and cleaning on our HVAC system.
I've used these guys twice now and their response time is great, they are friendly, informative, and most importantly, effective. I'm calling these folks every time my furnace sounds weird.
Response from the owner:Thank you for the wonderful feedback, Greg! We're glad to hear that you've had such positive experiences with our team. Providing timely and effective service is our priority, and we're here whenever you need us. Looking forward to assisting you again!
Excellent place to work with and installation crew were A+. They were able to get my new AC and Furnace installed quickly. I have breathing issues and disabled so this was a GREAT experience. If you need AC or Furnace installed this is your place.
Response from the owner:Thank you, Tony, for your wonderful feedback! We're glad to hear that our installation crew made the process smooth and efficient for you. Your satisfaction means a lot to us, and we appreciate your recommendation!
Fast, super friendly, and reasonable prices keep us coming back.
Response from the owner:Thank you! We're so glad to hear that our speed, friendliness, and prices keep you coming back. We appreciate your support!
Zachary was very friendly, efficient and knowledgable. He was able to service both units in 1 hour. I would recommend Thomas Hoffmann A/C for any future needs for me.
Response from the owner:Thank you, Michael! We're glad to hear that Zachary provided you with friendly and efficient service. We appreciate your recommendation and look forward to assisting you with any future needs.
Great service and went the extra mile for us . We would most definitely use them again
Response from the owner:Thank you, Andre, for your kind words and for recognizing our efforts; we can't wait to serve you again!
Thomas Hoffman air-conditioning and heating is so wonderful and professional! Nick Hoffman was the technician that diagnosed my malfunctioning air conditioning system and determined how to fix it. He was so incredibly professional and even invited me to watch while he worked, and kindly explaining to me all the details about the problem and how he is fixing it. I am now a client for life with this company because of how professional, knowledgeable, and a delight to work with they are! I want to add that they prioritized helping me on the same day that I called and even was a holiday (and 90 degree heat out!), so that is another outstanding Effort from this amazing company! Thank you so much.
Response from the owner:Thank you, Carrie, for your wonderful feedback! We're delighted to hear about your positive experience with Nick and our team. Your satisfaction is our priority, and we're glad we could assist you on the same day. Welcome to our family of clients!
They were able to come out quickly to help when our AC went down in the heat! They were prompt, kind, knowleadgable, explained everything easily in ways I could understand, fixed the issue, and made the experience so easy! I felt comfortable with the technican in and around our home working. Nick took the time to answer some questions about an unrlated issue while there. They will always be who we call for our heating and cooling needs!
Response from the owner:Thank you, Erin, for your wonderful feedback! We're glad to hear that our team, especially Nick, was able to assist you promptly and make the experience comfortable and easy. Your trust in us for your heating and cooling needs means a lot!
I highly recommend Thomas Hoffmann for anything involving HVAC. The person replacing my furnace, Britton Buehrig, was Professional and took pride in his work. The job was very cleanly done.
Response from the owner:Thank you, Ray, for your kind words and recommendation! We're glad to hear that you were provided with professional service and a clean installation. Your satisfaction means a lot to us.
Excellent service. AC went out on a hot summer day, hooked up with them through Angi, and within 2 hours they had arrived and fixed the problem. Can't ask for more than that
Response from the owner:Thank you for your kind words! We're glad we could help you quickly on that hot summer day. Your satisfaction means a lot to us!
Nick Hoffman was great. He came short notice to fix a leaky air handler did it quickly and efficiently and also took a look at the AC plan on using them again for our service of our HVAC
Response from the owner:Thank you, Jenny, for your kind words about Nick and for trusting us with your HVAC needs; we're glad to hear he was able to assist you efficiently!
Super company to deal with. Always professional, knowledgeable and friendly. Zachery was my technician and explained everything he did throughly and in a manner I could understand. Very nice guy.
Response from the owner:Thank you, Maggie, for your kind words! We're glad to hear that Zachary provided you with excellent service and clear explanations. We appreciate your support and look forward to helping you again!
My a/c was not working correctly and I knew it needed to be serviced. The person came and cleaned what needed to be cleaned and he did what he could for the output. He was very professional and nice. We will definitely call them for our future needs.
Response from the owner:Thank you for the positive feedback! We're glad to hear that you were pleased with our prompt and friendly service. We look forward to assisting you again in the future!
Great service
Response from the owner:Thank you so much for your kind words! We're grateful for your support and delighted to hear you had a great experience.
Nick arrived to repair our ac earlier than expected. He quickly diagnosed and made the necessary repairs. The cost was reasonable. We will definitely contact Thomas Hoffmann for hvac services in the future..
Response from the owner:Thank you, Michael! We're glad to hear Nick provided prompt and efficient service, and we appreciate your trust in Thomas Hoffmann for your future HVAC needs.
We have used Thomas Hoffman Air Conditioning and Heating for AC issues for the last two years. We have been so happy with the service we have received both times. This year, we just needed a little maintenance as our unit wasn’t working to its full potential. I called first thing in the morning and was able to get a same day appointment! Nick was so personable and knowledgeable, and he got us back up and running and no time. Thank you again for saving us from the summer heat!! We are so grateful for the amazing customer service you guys provide!!!
Response from the owner:Thank you so much, Teri, for your kind words and for trusting us with your AC needs over the past two years; we're glad Nick could help get your unit back to its best, and we truly appreciate your gratitude for our service!
I txt Thomas Hoffman air-conditioning and heating Sunday early evening about 6:30 and just left A detailed message of what was going on with my AC I received an automated reply, saying they would contact me soon. I heard from them the next Morning at 11 AM to confirm what was going on with my unit and said they would have a Tech out today still but would be the last call between 6 and 8pm. I expected to get an appointment 2 to 3 days later. We’re in the middle of about an 8 to 10 day Heat wave of Mid to upper 90s. So imagine my surprise when I received a call from Zachary at 3:20 telling me he was in Saint Charles and was on his way to my house to look at the unit. When I explained what was wrong on the phone, he was pretty confident. He knew what it was once he got here, pulled off the cover and sure enough it was the capacitor. Pull the old one off and install the new one turned it back on and boom I have cold air blowing. I would highly recommend Thomas Hoffman, AC and heating and if you can request a certain Tech Zachary is your guy he is great super Frndly got the job done quickly and even interacted with my dogs Who are super friendly
Response from the owner:Thank you, Vicki, for sharing your experience with us! We're glad to hear that Zachary was able to resolve your AC issue quickly and that he made a positive impression on both you and your dogs. We truly appreciate your recommendation and look forward to assisting you again!
We can’t say how happy we are with the quick and efficient service! We came home Friday evening after work on a 95 degree day (with a week of 90 degree weather ahead) and our A/C was totally out. We called this small business owner around 6pm and he was here by 7:25. He replaced our wires, had cool air running, gave us some helpful tips for the future, and was already out the door by 7:50. He was very polite, friendly, straightforward, and saved our evening/weekend!
Response from the owner:Thank you, Morgan, for your wonderful feedback! We're glad our team could provide quick and efficient service to keep you comfortable during the heat. Your satisfaction means a lot to us!
Giovanni was so great. Explained things so I understood. He is kind. I appreciated him cleaning up and being so nice. Thank you.
Response from the owner:Thank you, Peggy! We're so glad to hear Giovanni made your experience enjoyable and that his kindness stood out to you. Your appreciation means a lot to us!
Tom & Nick have taken care of all our HVAC needs for multiple properties for over a decade. Great team.
Response from the owner:Thank you, Kurt, for your kind words; we're grateful for your continued trust in our business for your HVAC needs over the years!
We recently moved into an older home and had an issue with the AC not working. We called and were offered a same-day appointment. Nick was fantastic—very knowledgeable and professional. He quickly diagnosed the issue with the air handler and got it fixed, and also installed a new thermostat for us. He was honest and straightforward with his recommendations and never pushed unnecessary products. Highly recommend!
Response from the owner:Thank you, Adriana, for your wonderful feedback! We're glad to hear Nick was able to help you with your AC issue and provide excellent service. Your recommendation means a lot to us!
Zach worked fast and answered all my questions with ease.
Response from the owner:Thank you, Stephanie! We're glad to hear that Zach provided you with quick and helpful answers.
Thomas Hoffman replaced my water heater. They were effective, efficient and pleasant people with whom to work.
Response from the owner:Thank you, David, for your kind words about Thomas and the team; we appreciate your feedback and are glad you had a positive experience with your water heater replacement.
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!
Answer: We recommend a twice-yearly maintenance schedule—once in the spring for your air conditioner, and once in the fall for your furnace. In the St. Louis climate, this keeps your system efficient, extends its lifespan, and helps you avoid surprise breakdowns during peak seasons.
Answer: This is one of the most common service calls we get in summer. Possible causes include:
- Low refrigerant levels (often due to a leak)
- A dirty air filter restricts airflow
- A malfunctioning compressor
- Thermostat set incorrectly
If your system is running but not cooling, it’s best to call for professional diagnostics, especially in humid St. Louis summers when AC is crucial.
Answer: Some sound is typical (like the fan running), but clanking, banging, squealing, or buzzing are signs of trouble. Noisy HVAC systems often point to:
- Loose parts
- Motor issues
- A failing blower or capacitor
Don’t ignore it—early attention can prevent major repairs.
Answer: Smart ways to boost HVAC efficiency in St. Louis homes include:
- Installing a programmable or smart thermostat
- Changing air filters monthly during high-use seasons
- Sealing ductwork and adding attic insulation
- Scheduling seasonal maintenance
If your system is over 10–15 years old, upgrading to a high SEER unit can significantly reduce cooling costs.
Answer: If your system is:
- Over 12–15 years old
- Breaking down frequently
- Running inefficiently (high energy bills)
- Using outdated R-22 refrigerant
…it may be more cost-effective to replace rather than repair. We offer free consultations to help you compare options and get the best value.
Answer: Common causes of AC leaks include:
- Clogged condensate drain lines
- Frozen evaporator coils
- Cracked drain pans
Water around your unit can damage flooring or drywall.
Answer: Strange HVAC smells are a red flag. Here’s what they might mean:
- Musty/mildew: Mold in ducts or drain lines
- Burning: Overheated motor or electrical issue
- Rotten egg: Potential gas leak (turn off system and call immediately)
Indoor air quality is critical, especially if someone in your home has allergies or asthma.
Answer: If you’re noticing a musty smell, allergy symptoms, or visible black spots near vents, mold could be the culprit. Homes in humid climates, like ours, are especially prone to moisture buildup in the ductwork.
Our team offers professional duct inspections and sanitization services, and we recommend the use of air purifiers or dehumidifiers to help prevent mold from returning.
Answer: HVAC sizing isn’t one-size-fits-all. Factors like:
- Square footage
- Insulation levels
- Window orientation
- Ceiling height
…all affect sizing needs. An oversized or undersized system will run inefficiently and cost more in the long term. We perform Manual J load calculations to ensure you get the right fit for your home.
10. Why should I choose a local St. Louis HVAC company, such as Thomas Hoffmann?
Answer: Unlike national chains operating under different names, we’re a locally owned and operated business that’s been serving St. Louis homeowners for decades. Our technicians live here, work here, and genuinely care about the community, so you receive honest advice, fast response times, and personalized service every time.
Need Help with Your HVAC System?
Whether you’re in Kirkwood, Chesterfield, or anywhere across the greater St. Louis area, Thomas Hoffmann Air Conditioning & Heating is ready to assist with fast and reliable HVAC service.
📞 Call us today (314) 471-7625 or schedule an appointment online for expert answers and hometown service you can trust.
