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R410A Refrigerant: What's Next

Learn about industry changes to air conditioner refrigerant and what St. Louis County homeowners can expect after the R22 refrigerant phase out. Read more!

What Is A SEER Rating?

It's one of the most important factors you should take into account when you're choosing a unit. So what is a SEER rating and what does it mean?

Preventative Maintenance Benefits

Spring snuck up on us a little early this year in the St. Louis area, which is all the more reason to start getting ready for the cooling season! Get the tips!

Jerry Kelly Helps Family in Need
Last fall, the family discovered that bad air quality in their home was causing Lizzy to get constantly sick. When Jerry Kelly heard about it, they did more than offer sympathy. They drew upon their expertise, and took action.
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Yes, Virginia, There are Polite Technicians
I had just about given up on seeing clean cut, polite technicians and installers in our industry. Many people say they don't exist. Learn More >>

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O'Fallon man feels lucky to be alive
Vincent Celano said he felt lucky to be alive after recovering from carbon monoxide poisoning. Emergency crews rescued Celano, 54, after he passed out in his O'Fallon home. Celano spent the night at St. Luke's in Chesterfield.
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Family, strangers make a difference
Dale Franklin never thought the simple ringing of a bell would sound so good. But when Dale and Belinda Franklin's daughter, 6-year-old Izzy, rang a bell in early February to signal the end of her chemotherapy, the tone also signaled a new chapter for the family.
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St Charles Heating & Air Conditiong Specialists

Jerry Kelly Heating & Air Conditioning: Your St Charles AC Repair & Installation Contractor

Check Out The Latest On The Jerry Kelly Blog
Why is My Furnace Blowing Cold Air? Common Answers for St. Louis Area Homeowners

Our furnaces are supposed to keep us warm, so it can be very concerning when you put your hand over one of your air vents and realize that your furnace is blowing cold air! This can happen for a number of different reasons, and the solution will depend on your specific situation. Today we’re going to [...]

Friday 21st November, 2014 READ MORE >>
How to Take Care of Your Heat Pump and Get It Ready for the Winter Ahead

If you have a heat pump installed in your St. Louis area home, then your home is heated by two sources: your heat pump and a backup furnace. This is different than a conventional heating and cooling system, which only uses a furnace to heat the home. Today we’re going to help owners of heat pumps [...]

Wednesday 19th November, 2014 READ MORE >>
Zoned Heating Can Solve These 3 Problems in Your Home This Winter

Conventionally, a furnace is used to heat your entire home at once. When your furnace is on, it sends warm air to every room in your house. When your furnace is off, none of the rooms in your house receive warm air. But if your home is like many other homes in the St. Louis [...]

Friday 14th November, 2014 READ MORE >>
How Does Carbon Monoxide Build Up in the Home and How Can You Avoid it?

Carbon monoxide (CO) can build up in your home’s air any time of the year, but it tends to be the biggest issue during the heating season. That’s because we use our fuel-burning appliances the most when it’s cold outside, and issues with those appliances can allow CO to build up in our tightly-sealed homes. [...]

Wednesday 12th November, 2014 READ MORE >>
Why Regular Maintenance Is So Important To Your Cooling System

What is Sick House Syndrome and Why Should St. Louis Homeowners Know About It?
Although Mother Nature has its own way of cleaning the air outside, the same can't be said for our homes. In fact, over the past 30-40 years, our homes have become more and more susceptible to polluted air — a phenomenon known as sick house syndrome.

So what is sick house syndrome and how can you protect your family from its harmful effects?
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What is a Home Air Cleaner and How is it Different Than a Filter?
Many St. Louis area homeowners are familiar with air filters and how they help protect your furnace from airborne particles. But did you know you have another option for protecting your furnace that also helps keep your family healthy? It's called a home air cleaner, and it's a great way to improve the air quality in your home.
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Gas Furnace Maintenance Tips for St. Louis Area Homeowners
Now that we've settled into the heating season here in the St. Louis area, it's a good time to talk about gas furnace maintenance and what you can do to keep your unit running smoothly throughout the winter.
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How Does a Heat Pump Work?
Although gas furnaces are the most common type of heating system found in St. Louis area homes, heat pumps are another great option for anyone who is looking to save energy and lower utility bills.

These highly efficient units can actually be used to both heat and cool your home. Since it is winter, we'll focus on explaining how a heat pump can heat your home, but it's worth noting that the process is simply reversed to cool your home during the summer.
Learn More >>

Jerry Kelly Testimonials

A NATE Certified Jerry Kelly Service Technician arrived just one hour after Tracey called to have her broken air conditioner fixed. She was so happy that she wanted to tell the world. See more >>


From Our Customers, Directly To You
The service with Jerry Kelly is always top notch. Our tech was wonderful, very informative and courteous.
-Stephanie T.

The technician was so nice — worth every penny! Also, he wore booties and I love that.
- Kim T.

Tech was most pleasant and informative one I have had of any type of tech I have had out here. Great appearance too! Means a lot!!
- Todd D.

Very pleased with furnace/a/c and glad we had both systems installed at same time. Techs are always impressively efficent and polite.
- Michael V.

Both systems run fine. Your company is always right on time, pleasant and very helpful. Thank you.
- Kathy C.

Thanks for coming out on short notice!! Your business hours are great.
- John W.

Your serviceman was the most courteous and knowledgeable. He's a "keeper".
- Artys G.

Audio Testimonials

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Local Reviews

Rated 4.9 out of 5 stars based on 1684 customer reviews

Map of St. Charles, MO

Great everything!




Love that you call or send a postcard to set up maintenance club appts. There was a part that needed to be replaced and it was covered under warranty. Love that my pocket book wasn't touched. So happy with the service. I tell everyone I know to use you guys. Thank you!


Map of St. Charles, MO

Great service





Map of O'Fallon, MO

Great service




Great service. The technician was very efficient and friendly.


Map of St. Charles, MO

Exquisite Service




Timely, complete, courteous, professional, outstanding knowledge and ability!


Map of St. Charles, MO

great service




Ben was very professional and did a great job.


Ben S.

Ben S.

Performed precision furnace tune up to ensure that the system is safe and operating at manufacturers specs.

Near N Main St, St. Charles, MO 63301
Damion O.

Damion O.

Servicing a furnace that has malfunctioned.

Near Concordia Ln, St. Charles, MO 63301
Matt B.

Matt B.

Repairing a furnace that has broken.

Near Sandy Bay Ct, Chesterfield, MO 63017
Will L.

Will L.

Performing a heat tune up on Jerry Kelly Emerald equipment.

Near Mid Rivers Mall Dr, St. Peters, MO 63376
Lucas M.

Lucas M.

Repairing a furnace that has malfunctioned

Near England Dr, O'Fallon, MO 63366
Will L.

Will L.

Performing a heat tune up on Jerry Kelly Emerald equipment.

Near Jungs Station Rd, St. Peters, MO 63303
Damion O.

Damion O.

Servicing a furnace that has malfunctioned.

Near Fox Ridge Dr, St. Charles, MO 63303
Lucas M.

Lucas M.

Repairing a furnace that has malfunctioned

Near Spencer Hill Ct, St. Peters, MO 63376
Shane  F.

Shane F.

Repairing a furnace that has broke down

Near Gazebo Ct, O'Fallon, MO 63368
Matt B.

Matt B.

Repairing a furnace that has broken.

Near Spring Way Dr, St. Peters, MO 63376
Matt H.

Matt H.

Another new Jerry Kelly Emerald high efficiency furnace and ac installation.

Near Wall St, St. Charles, MO 63303
Ben S.

Ben S.

Performed precision furnace tune up to ensure that the system is safe and operating at manufacturers specs.

Near Ken Dr, St. Charles, MO 63301
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Jerry Kelly Heating and Air Conditioning, Inc. | 800 N 2nd Street | Saint Charles, MO  63301 | 636-757-8506
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