Summer electric bill spike in St. Louis? Your AC is usually why. Five causes, what to check first, and honest fixes from a local team.
You open the electric bill, do a double take, and check that it is actually yours. Summer bills always run higher in St. Louis, but a genuine spike, noticeably worse than the same month last year, is usually your air conditioner telling you something. Cooling is the single biggest line item on a summer electric bill, so when the number jumps, the AC is the first place to look.
Nick demostrated excllent customer service,professionalism, and technician.
Response from the owner:Thank you, Kevin! We're glad to hear that Nick provided excellent customer service and professionalism. Your feedback is greatly appreciated!
We live in Dardenne Prairie, and want to thank Tom for his excellent work in assessing our A/C unit that stopped working over Labor Day weekend where the outdoor temps were 100+. Tom not only had the exact components on-hand but also offered other future solutions to make our home more comfortable. Very personable and professional! Thanks Tom!
Response from the owner:Thank you, George! We appreciate your kind words and are glad to hear that Tom provided excellent service during such a hot weekend. Your satisfaction is important to us, and we're here to help with any future needs!
Nick came out to our house in Valley Park. Super nice and helpful. Got our AC back to running!
Response from the owner:Thank you, Katherine! We're glad to hear that Nick was able to help get your AC running again. Your satisfaction is important to us!
Nick is a very knowledgeable HVAC professional. He quickly and thoroughly inspected my system. Highly recommend Thomas Hoffman AC.
Response from the owner:Thank you! We appreciate your kind words about Nick and are glad to hear you had a positive experience with Thomas Hoffman AC. Your recommendation means a lot to us!
My air conditioner went out, my son called, Nick was able to come out same day, very pleasant and professional.
Response from the owner:Thank you, Louise! We're glad to hear that Nick was able to assist you promptly and provide a pleasant experience. We appreciate your kind words!
Saturday. Labor Day Weekend. 100 degrees for the 4th day in a row and counting. A.C. goes out. No hvac companies well return calls and their phonebots say they're not available until Tuesday or Wednesday. Nick with Hoffmann answer's first ring and shows up in a couple hours, make short work of it, house is cooling nicely. Thanks Nick and Company.
Response from the owner:Thanks, Chris! We're glad Nick was able to help you out quickly, especially during such a hot weekend. We appreciate your feedback and are here for any future needs.
Response from the owner:Thank you, Susan! We're glad to hear you Nick represented our company in such an impactful way. Your feedback means a lot to us!
Response from the owner:Thank you, Don! We're glad to hear that you had a great experience and that Nick made such a positive impact. We appreciate your feedback!
Response from the owner:Thank you, Hank, for your wonderful feedback; we're glad you enjoyed the fast, friendly, and professional service, and we'll be sure to keep up the great work!
Our tech was scheduled to arrive to our house in Brentwood only a few hours after I called. Nick was great and was able to address the issue quickly. Thanks again!
Response from the owner:Thank you, Jack! We're glad to hear that Nick was able to resolve the issue quickly for you. Your satisfaction means a lot to us!
Nick was amazing!!! He came out after hours to my home in Creve Coeur when my AC stopped working. He was professional, knowledgeable, and genuinely helpful. I really appreciate him going above and beyond when I needed help. Highly recommend!
Response from the owner:Thank you, Melanie! We’re glad to hear that Nick provided such excellent service and went above and beyond for you. Your recommendation means a lot to us!
Clear communication about arrival, service and costs.
Response from the owner:Thank you, Margaret, for your kind words! We appreciate your feedback on our clear communication and are glad you had a positive experience.
Very prompt response and very professional and conscientious repair service. Nick did a great job and is a very nice guy.
I apparently have an intermittent problem that did not occur today. Your technician was excellent and system is now working, so I will call if issue recurs. You have terrific associates.
Response from the owner:Thank you, Rich! We're glad to hear you had a great experience with our repair service. Nick will be pleased to know his efforts made a positive impression. We appreciate your feedback!
Amazing response time and service for AC replacement! Our AC failed on Monday evening, Nick came out to inspect and give us options within the hour, and we had a new AC installed by 1pm on Tuesday. Great team and very happy
Response from the owner:Thank you, David! We're glad to hear about your positive experience with our team, especially with Nick's quick response and the timely installation. Your satisfaction means a lot to us!
I can’t say enough wonderful things about Thomas Hoffmann Air Conditioning and Heating! Nick came promptly, which was such a relief, and from the very beginning, he was personable, professional, and incredibly honest.
After dealing with other companies, Nick’s honesty really stood out. He took the time to explain everything clearly, answer my questions, and make sure I understood what was going on—without any pressure or unnecessary recommendations. It was refreshing to feel like I was dealing with someone who genuinely cared about doing the right thing for the customer.
Nick’s professionalism, knowledge, and customer service were truly top-notch. I wouldn’t hesitate to recommend Thomas Hoffmann Air Conditioning and Heating to anyone looking for a heating and cooling company you can actually trust!
Response from the owner:Thank you for the 5-star rating, Lori!
So professional and came within 10 minutes of our emergency! Nick was 10/10!!!
Response from the owner:Thank you, Logan! We're glad to hear that our team responded quickly and that Nick made such a positive impression. Your feedback means a lot to us!
They did great work on a tight timeline. They saved our business that day! Very professional and smart. I will use them every time!
Response from the owner:Thank you, John! We appreciate your kind words and are glad we could help your business on such a tight timeline. Looking forward to working with you again!
The service was excellent! When we arrived home after 8 pm, seen our unit was not working and it was almost 85 degrees in our home my husband began calling all of the companies that said they were 24 hrs. Thomas Hoffman heating and cooling was the only company that honored the statement. Nick was at our home in a very timely manor and was also able to fix our unit quickly! I would highly recommend to anyone needing any hvac services!
Response from the owner:Thank you, Morgan! We're glad to hear that you had an excellent experience with our service. It's great to know that Nick was able to assist you promptly and effectively. We appreciate your recommendation and look forward to helping you again in the future!
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.
Thomas Hoffman HVAC provides excellent service. The staff members are very nice, respectful and knowledgeable. I always feel comfortable with the advice I have been and the fees for repairs. Whether we see one of the companies employees or Thomas himself we have always had a good experience and highly recommend them. I am thankful to have found a trustworthy company to count on for my future needs.
Response from the owner:Thank you for the 5-star review, Lisa. We appreciate the support!
First, Rule Out the Boring Explanations
An honest company tells you this part first. Before assuming your AC is failing, check two things. Compare this month’s usage in kilowatt hours, not dollars, against the same month last year; if usage is similar but the bill is higher, your utility’s rates went up, and your AC is innocent. Then consider the weather: a stretch of 100-degree heat-index days forces even a healthy system to run harder. Your utility’s website usually shows both numbers side by side. If your usage itself jumped and the weather was roughly normal, keep reading. Something in your system is working harder than it should.
1. A Clogged Filter or Dirty Coils
The most common culprit and the cheapest fix. A loaded filter chokes airflow, and grime on the indoor or outdoor coils blocks heat transfer. Either way, the system runs longer cycles to hit the same temperature, and every extra minute shows up on the bill. St. Louis makes this worse: long cooling seasons, heavy pollen, and cottonwood fluff coating outdoor units by mid-June. Replace the filter and gently clear debris from around the outdoor unit. Deep coil cleaning is part of a professional tune-up.
2. A Slow Refrigerant Leak
Low refrigerant is sneaky because the AC still works, just badly. It runs longer, cools less, and removes less humidity, so you feel warm and sticky while paying more. If your bills have crept up over two or three summers while comfort has crept down, a leak is a strong suspect. This is a certified technician repair: find the leak, fix it, and recharge the system.
3. Leaky or Uninsulated Ductwork
In many St. Louis homes, ducts run through attics that hit 130 degrees in July. If those ducts leak, and studies suggest a meaningful share of homes lose a significant portion of conditioned air through duct leaks, you are paying to cool the attic. Telltale signs: rooms that never quite cool, dust buildup near vents, and bills out of proportion to thermostat settings.
4. Short Cycling
If the system starts, runs a few minutes, and shuts off over and over, that is short cycling, and those constant starts draw far more power than steady running. Causes range from a failing thermostat or capacitor to icing coils or a system that was oversized on day one. Short cycling also beats up the compressor, so it is worth a professional look sooner rather than later.
5. A System Simply Wearing Out
Efficiency declines with age. A 12 to 15-year-old unit can use more electricity than a modern high-efficiency system to do the same job, and in St. Louis, our humidity accelerates that aging. If your system is in that range and the bills keep climbing, the spike is part of the repair-or-replace conversation and deserves honest math, not a sales pitch.
What to Do Next
Check the filter, clear the outdoor unit, and compare your usage history. If the numbers still do not make sense, a diagnostic visit can usually pinpoint the cause in one trip, and you get a written explanation of what we found and what it costs to fix before any work begins.
Contact Tom Hoffmann Air Conditioning & Heating Today
Tired of paying for your AC’s bad habits? Call (314) 471-7625 or schedule service online. A real St. Louis dispatcher answers 24/7, and our AC repair team will tell you exactly what your system has been trying to say.
