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O’Fallon, MO HVAC Contractors

Design Aire Heating & Cooling is an HVAC contractor serving O’Fallon, Missouri.

   Contact Design Aire Heating & Cooling in O’Fallon: (636) 736-0006

At Design Aire Heating & Cooling, our service professionals provide quality repairs, installations, and replacements for all of your heating and air conditioning needs in O’Fallon, Missouri.  

Our O’Fallon, MO HVAC services include:

No matter your concern, we’re available 24/7 to help. Call (636) 736-0006 to schedule services or request a free online estimate.

We service the following zip codes in O’Fallon: 63304, 63376, 63366, 63367, 63368.

Even with newer HVAC systems today, you can expect occasional problems to occur such as your heater not blowing cold air as it should or an unexpected smell coming out of your air conditioner.

No matter if your HVAC system needs minor repairs, or a complete install and replacement, our technicians are there for you. Design Aire has been in the heating and cooling business for over 100 years and our customers stay with us long-term because our service is reliable and our rates are fair. You can count on us for all your HVAC needs!

A Trusted O’Fallon, MO Heating & Cooling Contractor Since 1904

Our region is well known for extreme humidity and a hot summer season, so it’s no wonder we have grown reliant on our air conditioners to keep our homes comfortable during this warm time. If your AC unit has suddenly stopped working, or if you are dealing with the same issues frequently and want answers, contact our technicians for help! We will take the time to diagnose your air conditioner problem and work towards a solution to get your home back to a more comfortable temperature.

When the temperatures turn from warmer to cooler, having a furnace that works when you need it is important. If you have a furnace that has worked in other seasons but has suddenly stopped working this year, we can help! Our technicians can inspect your furnace for common problems, and even uncommon ones, and find a way to repair it so it’s working once more. We have the experience and customer service you expect from one of the top HVAC companies in the area.

Your air conditioner usually runs in the background unnoticed, but if you no longer have it, you notice quickly that a replacement is necessary! Contact Design Aire to learn how our equipment and know-how can get you back on track with a new, more efficient air conditioning system before you know it!

Like an air conditioner, a furnace may be reliable one moment and the next completely stop working. When this happens, a replacement is in order! Our technicians can get your system back online in short order, replacing your unit with a more dependable one that probably runs better than what you have. What’s not to love about that?

Depend on our team to provide you reliable service you expect from one of the most trusted HVAC service providers in O’Fallon! Our team is comprised of dedicated technicians who not only understand what you’re going through, but they work to make it right through their knowledge and are dedicated to excellent customer service.

Customers in O’Fallon have come to depend on us not only for furnace maintenance and HVAC products but to install systems as part of new construction HVAC projects. We have been recognized in our industry through numerous service awards as the #1 Trane Dealer in the Midwest and have held that honor for more than 10 years. Contact us today for help and to experience our service for yourself!

Call us today at (636) 736-0006 or contact us online to request service, get a free estimate, or learn about our HVAC maintenance plans.

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Financing is provided with approved credit by Wells Fargo Bank, N.A., an Equal Housing Lender.
Design Aire offers special financing with approved credit with this secure application:

Get Wells Fargo Financing ApplicationGet Wells Fargo Financing Application

Customer Testimonials

Seth was our salesperson. He listened to our needs and provided the right product at the right price. The installation team arrived on time and went right to work.They worked with confidence and professionalism.We appreciated the care in protecting our floors and even the choice of how they went up on the roof indicated that they really did care. This company did what they said they would and certainly has our vote of appreciation and gratitude. We will happily recommend Design Aire to anyone.

Ken L.

One of the best companies to work with. My own profession is in a service industry and so I very much appreciate all the positive things about Design Aire.
The install crew arrived right on time and took exactly how much time they said they would to complete the job. The work was done well, the crew cleaned up after themselves, and were very pleasant. Seth in the office was extremely in-tune to our needs and very responsive.
I would highly recommend Design Aire.

Heather H.

Our new HVAC system was installed yesterday and we could not be happier. From quote to completion the process was great! 100% would recommend!

Greg H.

We have used Design Aire for both a new furnace two years ago and a new AC unit this summer. Everything was done very professionally and quickly. I would not hesitate to recommend them to anyone needing any type of HVAC work done.

Sean K.

Design Aire was the best choice from start to finish. Design Aire gave me the best price with the most detailed quote. The service technicians were very friendly and completed the job ahead of time. I highly recommend Design Aire.

John K.

We've used them for our old house and our new house. They are honest, friendly, professional and affordable. We felt lucky to find them.

Maddy R.

I was very impressed with Design Aire. They were timely and did an outstanding job with the installation of my new furnace. They had great communication and went above and beyond. I would highly recommend them to friends and family. Thank you so much Seth and Design Aire for making this an effortless transaction. VERY PLEASED!

Jonny M.

Design Aire sent a salesman to plan the system, and just a couple of days later sent the installers to remove the old system and install the new one. Everything happened when they said it would and the system performs as they said it would. All of the Design Aire staff were courteous, the work was performed efficiently and neatly, and they left the area cleaner than they found it. This is the second unit Design Aire has installed for us, and I have no need to look elsewhere.

Dan L.

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