If your air conditioner keeps turning on and off every few minutes, it’s usually a sign that something isn’t working correctly.
This issue is commonly known as AC short cycling, and it can lead to higher energy bills, reduced comfort, and unnecessary wear on your HVAC system.
For homeowners in St. Louis, short cycling is especially frustrating during hot, humid summer days, when your air conditioner should be running steadily to keep your home comfortable.
I’ve been using “THOMAS Hoffmann Airconditioning and Heating LLC” for years now. We have a 30 +\- year old system that works perfectly for us. Although we’ve not had to use it yet, it is comforting to know they offer a 24 hour on call service. I really appreciate that the technicians don’t try to upsell us on anything. They’re a very professional, knowledgeable, and courteous, local-family owned and operated business. I’ve also found their pricing to be very fair and by”fair” I don’t mean “cheap” but reasonable… especially for the quality of service provided by THOMAS Hoffmann HVAC. I love supporting smaller family owned business and this one is top-notch! Thank you guys!
Response from the owner:Thank you so much for your continued support and kind words, Mari! We truly appreciate your loyalty and are glad to hear about your positive experiences with our services. We look forward to continuing to provide you with top-notch service in the future.
Excellent service from Nick! Friendly was super knowledgeable!
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.
Our service technician arrived right on time and was professional, friendly, efficient and courteous. We couldn’t ask for more.
Response from the owner:Thank you for sharing your positive experience with our service technician! We appreciate your kind words and are glad to hear that you were satisfied with the service provided.
Nick was was great! He provided great service, explained everything, and was patient and kind.I definitely recommend using Hoffman!
Response from the owner:Thank you, Marilyn! We're glad to hear that Nick provided you with excellent service and made your experience enjoyable. We appreciate your recommendation!
The whole team was great, professional and friendly. Scheduling was easy and well organized, they had many options for different price points and financing options. Thank you!
Response from the owner:Thank you for the thoughtful review, Jasmine! We appreciate your support and continued business.
Love that it’s the same technician every time. Let’s me know what he found and any concerns he might have regarding our units. Great customer service.
Response from the owner:Thank you, Theresa! We're glad to hear you appreciate having the same technician and the communication about your units. Your feedback on our customer service means a lot to us!
From the phone to the completion of the job everyone is so polite and informative. I had Giovani as our representative and he was very informative and professional, and knew exactly what the problem was. Thanks so much.
Response from the owner:Thank you for the kind review, Frank! We appreciate you and your business.
Zach did an excellent job! Always courteous and friendly. We would highly recommend calling Thomas Hoffmann HVAC for any heating and cooling needs.
Response from the owner:Thank you, Allan! We're glad to hear that Zach provided excellent service and appreciate your recommendation for Thomas Hoffmann HVAC.
Was able to locate the problem right away and replace a switch and add Freon very nice job by this employee. I will recommend Thomas Hoffman for future references.
Response from the owner:Thank you, William! We're glad to hear that our team was able to quickly address the issue and that you had a positive experience with Thomas. Your recommendation means a lot to us!
I had Nick come out. He was awesome. Very knowledgeable, prompt and helpful. I will definitely recommend Thomas Hoffmann HVAC to others in need of HVAC support.
Response from the owner:Thank you, Jack! We're glad to hear that Nick provided you with excellent service. We appreciate your recommendation and look forward to assisting you and others in the future.
From our initial quote until the new furnace and AC were completed, everything was smooth and efficient. Zachary and Giovanni were excellent on-site, taking time to explain the installation as well as leaving the home clean. Thank you Thomas Hoffmann team
Response from the owner:Thank you! We're glad to hear that the installation process was smooth and efficient. Zachary and Giovanni will be pleased to know their efforts made a positive impact. We appreciate your kind words about the team!
Update 4/6/26: Zach Sperling is such a pleasant and knowledgeable technician that I recommend him highly. Thomas Heating has been a wonderful company to work with in my maintenance plan. If you are looking for a reputable company, look no more.
This company is so responsive that I love them. They respond immediately, and I trust them to tell me what needs to be done. I haven’t been steered wrong yet. They are genuinely nice to work with and honest. I use their maintenance program which I highly recommend.
Response from the owner:Thank you for your kind words, we truly appreciate your trust in us and are glad to hear about your positive experience with our services.
work good but got at least 6 messages from them very annoying
Response from the owner:Thank you for your feedback, Harold. We appreciate your input and understand how too many messages can be frustrating. We'll work on improving that experience for you.
Nick was great! He came right out and was able to solve the problem fairly easily. He communicated well and helped us prevent a future problem as well.
Response from the owner:Thank you for the review, Philip! We are happy to hear you had a pleasant experience working with us.
Response from the owner:Thank you, Pat, for your kind words about Giovanni; we appreciate your feedback and are glad to hear that he made a positive impression.
They have never failed to fix my hvac problems. These folks are top tier.
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!
Giovanni was very professional, helpful, patient and helped me figure out the issue, if it was covered under warranty, and next steps. Great overall experience and much appreciated.
Response from the owner:Thank you, Amy! We're glad to hear that Giovanni provided you with such professional and helpful service. Your appreciation means a lot to us!
Always professional and thorough whenever they service our home. We have used Thomas Hoffmann Air Conditioning & Heating multiple times since we moved into our home and will continue to use them in the future.
Response from the owner:Thank you for the thoughtful review, Joe. We appreciate you and your business!
0 stars if I could. Bought a faulty (not to mention overpriced) surface igniter, called back five minutes later after installing, of course they didn’t stand behind their part. Go to Grainger instead. Same (working) part, half the price.
Response from the owner:Hi there. I am unable to locate your customer profile. Please give our office a call at 314-471-7625 so we can get this figured out for you.
My furnace was not working. A very nice gentleman came out this morning and fixed the problem and now I have much needed heat. He was very professional and courteous. I will definitely be using them again when the need arises.
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!
I will always call Hoffmans for my air and heat needs. They were out to my daughters house that day and fixed it. It was right before the weekend storm with below zero temps the next day. They saved my daughter and grandbabies. I could never thank them more.
Response from the owner:We are so happy to hear that we could help! Thank you for the kind review.
Snow and drifting snow covered intake and out take vents causing the furnace emergency to shut off furnace. Cleaned off the driftibg/ snow off roof and vents furnace works perfect now. Thank you and great job Nick.
Response from the owner:Thanks for the great review, Scott! We appreciate your support.
5 stars! Nick was here to fix my heater within 2 hours of my call. He explained the problem to me thoroughly and got the job done quickly & professionally. Thank you so much!
Response from the owner:Thank you for the kind review, Jennifer! Glad we could help.
Extremely thorough and educational. They do a wonderful job of explaining everything and making sure I was comfortable knowing how the systems worked in my house!
Response from the owner:Thanks for the great review, Matthew! We appreciate your support.
Nick did an amazing job, on time, very knowledge and professional.
Response from the owner:Thank you for the great review, Joe. We look forward to servicing you in the future!
What is Air Conditioner Short Cycling?
Short cycling happens when your air conditioner:
Turns on
Runs briefly
Shuts off quickly
Then turns back on again shortly after
Instead of completing a full cooling cycle, the system repeatedly starts and stops. Normally, an air conditioner should run for 10–15 minutes per cycle, or longer, depending on outdoor temperatures and cooling demand. When cycles become extremely short, the system never fully cools your home or properly removes humidity.
Why Short Cycling Is a Problem
When your AC keeps turning on and off, it can cause several issues:
One of the most common causes of AC problems is a clogged air filter. When the filter becomes dirty, airflow through the system is restricted. This can cause the evaporator coil to become too cold, disrupting normal operation. Symptoms may include:
AC turning off quickly
Reduced airflow from vents
Ice forming on the indoor coil
Changing the air filter every 1–3 months can help prevent this problem.
If your AC coil freezes, the system may begin short-cycling. Frozen coils often occur due to:
Dirty air filters
Blocked vents
Low refrigerant levels
Poor airflow
When the coil freezes, the AC may shut down to prevent damage. If you notice ice on refrigerant lines or the indoor unit, it’s time to schedule AC repair.
Many homeowners are surprised to learn that an oversized AC can cause short cycling. A system that is too large cools the home too quickly and shuts off before completing a full cycle. This leads to:
Frequent on-and-off cycles
Poor humidity removal
Uneven temperatures
Oversized systems are sometimes installed when proper load calculations are skipped.
Electrical components help regulate when your AC starts and stops. If these components begin to fail, the system may cycle erratically. Possible electrical issues include:
Failing capacitors
Loose wiring connections
Control board problems
Contactor issues
Electrical repairs should always be handled by a licensed HVAC technician.
5. Blocked or Closed Vents
Your HVAC system relies on balanced airflow throughout your home. If too many vents are closed or blocked, pressure builds up in the duct system and can interfere with proper system operation. This can cause:
Short cycling
Reduced airflow
Uneven cooling
Make sure supply vents and return vents remain open and unobstructed.
Signs You Should Call for Air Conditioner Repair
Short cycling should never be ignored. You should schedule AC repair if:
Addressing the issue early can prevent more expensive repairs later.
How Regular AC Maintenance Prevents Short Cycling
Many causes of short cycling can be prevented with regular HVAC maintenance. A professional AC tune-up typically includes:
Checking refrigerant levels
Cleaning condenser coils
Inspecting electrical components
Checking airflow
Testing thermostat operation
Inspecting the evaporator coil
Regular maintenance helps your system run efficiently and reliably during the St. Louis summer.
Air Conditioning Repair in St. Louis
If your air conditioner keeps turning on and off, a professional inspection can identify the cause and restore proper operation. Thomas Hoffmann Air Conditioning & Heating LLC provides trusted AC repair services for homeowners throughout the St. Louis metro area. Call today to schedule AC repair:(314) 471-7625
24/7 Service Call Now
At Thomas Hoffmann Air Conditioning & Heating, we pride ourselves on being a locally owned and operated HVAC company. With more than 30 years of experience and a master technician and mechanical engineer as our owner, we can replace, repair, and maintain your business or home’s HVAC system.
