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O’Fallon, MO Heating & Cooling Services

5.0 Rating

Trusted HVAC Service In O’Fallon Since 1977

There are more than a few reasons Jerry Kelly Heating & Air Conditioning has been selected as the winner in the Heating & Cooling service category of the St. Louis Post-Dispatch Best of St. Charles awards 23 times running. In addition to delivering impeccable workmanship and superior customer service to O’Fallon, MO homeowners, we provide: 

  • Top-rated air conditioning, heating and indoor air quality services.
  • Dependable, 24/7 answering system.
  • Flexible scheduling to meet your needs.
  • Over 50 years of continued education in the field.

Whether you’re in need of a furnace installation, air conditioner repair, or water heater maintenance check, our friendly and professional team will simply make it work. We urge you to read what some of our valued customers have to say about our O’Fallon, MO heating and air conditioning solutions and services on our resources page.

“The HVAC technician was very knowledgeable & identified the issue within minutes of accessing my furnace. He was also able to alert me of maintenance concerns I didn’t know about it. I would definitely recommend Jerry Kelly and the crew to my neighbors!”
Robertson – O’Fallon, MO

Give us a call at 636-757-8506 to schedule heating and cooling service in O’Fallon today!

Is Jerry Kelly considered an essential (COVID-19) service provider in O’Fallon MO?

Yes, Jerry Kelly is an essential service provider during the COVID-19 virus outbreak. This is because Jerry Kelly provides vital HVAC, Indoor Air Quality and Water Heater services that are essential for maintaining the safety, sanitation, and operation of residences and businesses. HVAC contractors like Jerry Kelly have unique skills that are important to public health and welfare.

How is Jerry Kelly protecting its customers and service technicians during the COVID-19 outbreak in O’Fallon MO?

Jerry Kelly HVAC service technicians who come to your home or business will adhere to the CDC's guidelines designed to stop the spread of COVID-19. Jerry Kelly has enhanced its already strict cleaning and disinfecting measures to ensure the safest possible service experience for its customers and employees, including wearing personal protective equipment, and practicing social distancing. Also, our HVAC technicians are using hand sanitizer in between hand washes.

What causes an air conditioner to stop working near O’Fallon?

If your air conditioning unit is not working, there might be a number of reasons why. Some common reasons why include:

  • Tripped circuit breaker - Air conditioners typically have an indoor and an outdoor circuit breaker. Make sure your outdoor breaker is not tripped. If you reset it and it trips again, you will need to contact a professional to determine what is wrong. 
  • Dirty evaporator coils - Dust, dirt and dander can build up on evaporator coils and can cause a total breakdown of the system. Regular AC maintenance can help prevent this from happening.
  • Dirty condenser lines - Over time, mold and algae can grow on condenser lines, clogging them and causing the air conditioning unit to malfunction.
  • Faulty motor - If the unit had been making unusual sounds before it stopped working, the motor is probably broken. 
  • Broken thermostat - If the thermostat is not working properly, it can stop the air conditioner from turning on. 

For more information on air conditioner troubleshooting, contact Jerry Kelly Heating and Air Conditioning. We pride ourselves on being the premier heating and air company in the O’Fallon area. Call us 24 hours a day, 7 days a week at (636) 757-8506.

How often should you have your air conditioner serviced near O’Fallon?

You should have an air conditioning maintenance service performed on your unit annually. Regular service will help prevent malfunctions in the future and keep your unit running efficiently and effectively.

After 40 years in the business, Jerry Kelly knows a thing or two about ACs. Contact us online or call us today to schedule your air conditioner maintenance service at (636) 757-8506. You’re in good hands with Jerry Kelly, and we’re proud to serve the community of O’Fallon.

How much does it cost to have your HVAC system serviced near O’Fallon?

Residents in the O’Fallon area can expect to pay between $150 - $300 a year to have their HVAC system inspected and maintained

After 40 years in the business, Jerry Kelly knows a thing or two about HVAC units. Contact us online or call us today to schedule your HVAC maintenance service at (636) 757-8506. You’re in good hands with Jerry Kelly.

Local Reviews
for Ofallon, MO

Jerry Kelly Heating & Air Conditioning Rated 4.9 out of 5 stars based on 14 customer reviews

Map of Ofallon, MO

Great service!


Deutsch - Ofallon, MO


Review of Jerry Kelly Heating & Air Conditioning

Tech did a great job and explained everything he did to me


Map of Ofallon, MO

on time and informative


dan - Ofallon, MO


Review of Jerry Kelly Heating & Air Conditioning

Very satisfied, especially being on time


Map of Ofallon, MO

Great Service!


Barbara - Ofallon, MO


Review of Jerry Kelly Heating & Air Conditioning

Jeff was knowledgeable, friendly, helpful and thorough.


Map of Ofallon, MO

I was happy to have service early due to a cancellation.


mrs Betty - Ofallon, MO


Review of Jerry Kelly Heating & Air Conditioning

Your screen is hard to read as the type color is very pale.


Map of Ofallon, MO

Very professional presentation and follow-up service.


Ken - Ofallon, MO


Review of Jerry Kelly Heating & Air Conditioning

The first service call did a very good job of listing my options in terms of risk and cost. The installation and the system were first rate and so far, the results show I made a good decision. My electric bill went down by half. We also liked the follow-up courtesy call.


Map of Ofallon, MO

Great service. He answered all of our questions.


Joe - Ofallon, MO


Review of Jerry Kelly Heating & Air Conditioning

We are very happy with our new sur conditioner and heater. The service is phenomenal.


Map of Ofallon, MO

always great service


vee - Ofallon, MO


Review of Jerry Kelly Heating & Air Conditioning


Map of Ofallon, MO

best service


hodson - Ofallon, MO


Review of Jerry Kelly Heating & Air Conditioning


Map of Ofallon, MO

quick response


steven - Ofallon, MO


Review of Jerry Kelly Heating & Air Conditioning


Map of Ofallon, MO

Answered questions and offered suggestions to extend life of unit


Bouchillon - Ofallon, MO


Review of Jerry Kelly Heating & Air Conditioning

I took his advice


Everyone was very professional and we received a great price!


Joe - Ofallon, MO


Review of Jerry Kelly Heating & Air Conditioning

We will definitely recommend Jerry Kelly to our friends and family!


Exceptional Service, from Beginning to End!


Mary - Ofallon, MO


Review of Jerry Kelly Heating & Air Conditioning

I caught the salesman, Bryan Jones, on his day off and he still took the time to give me an estimate and get everything lined up. The installation was very professional and fast. Thank so much for rescuing us from another miserable summer. Mary & Steve


thank you


Matthew - Ofallon, MO


Review of Jerry Kelly Heating & Air Conditioning


Always a Great Experience!


Chris & Angela David - Ofallon, MO


Review of Jerry Kelly Heating & Air Conditioning

We wouldn't use or trust anyone other than Jerry Kelly. Always professional, friendly and thorough.


Ryan S.

Ryan S.

Troubleshooting an air conditioner that broke down.

Near Chestnut Hill Dr, OFallon, MO 63368
Will L.

Will L.

Repairing an air conditioner that had malfunctioned.

Near N Main St, OFallon, MO 63366
 Andy B.

Andy B.

install new high efficiency jerry kelly air conditioner

Near Brook Hollow Dr, OFallon, MO 63366
OFallon, MO - install new high efficiency jerry kelly air conditioner
David G.

David G.

Doing an a/c startup.

Near Sandtrap Dr, Ofallon, MO 63368
Ronan  w.

Ronan w.

furnace repair

Near Stonewall Creek Dr, Ofallon, MO 63368
Shane  F.

Shane F.

cleaning

Near Autumn Ridge Dr, Ofallon, MO 63366
Will L.

Will L.

clean and safety check on a Jerry Kelly emerald 90 percent efficient furnace with a humidifier #runninggreat

Near Rosedale Dr, Ofallon, MO 63366
Matt H.

Matt H.

Just installed another new Jerry Kelly Emerald high efficiency furnace and ac.

Near Cypress Point Dr, Ofallon, MO 63366
Shaun M.

Shaun M.

Repairing a malfunctioning air conditioner.

Near US-40, Ofallon, MO 63368
Shaun M.

Shaun M.

Repairing a malfunctioning air conditioner.

Near US-40, Ofallon, MO 63368
Jeff T.

Jeff T.

gas furnace

Near Aspencade Cir, Ofallon, MO 63376
Jeff T.

Jeff T.

furnace check

Near Aspencade Cir, Ofallon, MO 63376
Steve L.

Steve L.

heat tune up

Near Worcester Ct, Ofallon, MO 63366
Jeff T.

Jeff T.

no cooling

Near Forest Acres Dr, Ofallon, MO 63366
Will L.

Will L.

tuning up a Jerry Kelly 90 percent efficient furnace to keep it running at its best #cleanandcheck#heatson

Near Christina Marie Dr, Ofallon, MO 63368
Jeff T.

Jeff T.

electric furnace tuneup

Near Forest Acres Dr, Ofallon, MO 63366
Ronan  w.

Ronan w.

furnace cleaning

Near Babble Creek Ln, Ofallon, MO 63368
michael M.

michael M.

emerald furnace tune up

Near Quillpen Ct, Ofallon, MO 63366
Ofallon, MO - emerald furnace tune up
John W.

John W.

furnace tune up

Near Black Horse Dr, Ofallon, MO 63368
Ronan  w.

Ronan w.

furnace maintenance

Near Piepers Glen Ct, Ofallon, MO 63366
Shane  F.

Shane F.

cleaning

Near Sandy Creek Dr, Ofallon, MO 63366
Shane  F.

Shane F.

cleaning

Near Quiver Dr, Ofallon, MO 63366
Mike S.

Mike S.

emerald gas furnace tune up

Near Cordes St, Ofallon, MO 63366
Shane  F.

Shane F.

cleaning

Near Quiver Dr, Ofallon, MO 63366
Shane  F.

Shane F.

cleaning

Near Quiver Dr, Ofallon, MO 63366
The Most Important Part of Our Company is Our Customers

Service Areas & Reviews