Air Conditioning Installation Services in St. Louis & St. Charles, MO

Even if you maintain your A/C unit for years, there will come a time you need to replace your system with a new one. Having a skilled technician manage both the installation and replacement of your air conditioner means you can depend on one professional to get the job done right the first time.

   Contact the Air Conditioning Experts of St. Louis & St. Charles, MO: 314-739-1600

Contact the Air Conditioning Experts of St. Louis & St. Charles, MO:


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At Design Aire, we pride ourselves on good work for a good price, and we stand by our values. We know you have many options throughout St. Louis and St. Charles for HVAC assistance, and we hope you’ll choose us to replace and install your new A/C unit. We service all makes and models, and because of our extensive experience, we have quality parts needed to make your new system run well no matter who manufactured it.

In addition to many awards and accolades recognizing our team for a job well done, we are the #1 Trane Dealer in the Midwest and have held that distinction for over a decade.

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Signs Your Air Conditioner Needs Replacing

  1. Airflow is limited and does not blow cold air – Often the first sign that air conditioning repair is needed; an A/C unit that either stops blowing cold air or has limited airflow compared to in the past can be a major sign that a full system failure is imminent. Sometimes this is a sign of a minor problem, such as a clogged drain, so it’s best to have a trained technician inspect the unit to determine if a fix is necessary or if the whole system needs replacing.
  2. A/C unit makes strange sounds – If your air conditioner makes grinding, squeaking, or other unusual sounds that were not present before, it could be a sign that your unit is reaching the end of its shelf life and is in need of replacing.
  3. Moisture buildup present – The presence of moisture should come as no surprise to anyone who has an A/C unit. However, excess moisture from a refrigerant leak or that leads to mold growth can be a sign that your system is beyond repair and needs to be fully replaced.
  4. Bad smell comes from the A/C unit – Like with limited airflow or a lack of cold air coming from your air conditioner, a bad smell can be attributed to a minor repair or cleanup. However, strange smells coming from a system that usually has neutral-smelling air can be a definite sign that something isn’t right with your system and needs to be checked.
  5. Energy bills have increased over time – Air conditioners are designed to run efficiently, meaning they work well without driving your bills higher. However, if you have noticed your energy bills increase even during seasons where you use your A/C less, then it’s time for a technician to diagnose your system problem and recommend repairs or even a full replacement.

Air Conditioning Installation and Replacement Add-On Services

Along with A/C unit install and replacement, we offer a number of replacement and installation add-on services such as custom sheet metal fittings and duct sealing to keep your system running as it should for years to come.

  • Custom Sheet Metal Fittings – Our install trucks include a Pittsburgh machine and a metal brake which allow us to fabricate a single-piece supply plenum specifically sized for your system whenever necessary. This custom ductwork assures you the best airflow and performance for your new system. Design Aire distinguishes itself from other companies with its unmatched sheet metal craftsmanship. As members of Sheet Metal Workers’ Union, Local 36, our installers possess superior skills and knowledge about the craft of sheet metal fabrication.
  • Duct Sealing – The main areas for air leakage on your system occur closest to the blower (those locations have the highest pressure). We seal the ductwork at your coil, supply plenum, and return airdrop to prevent air loss at these critical points.

If you do end up needing your whole air conditioner replaced or want to take preventative steps now to ensure your system lasts longer, it might be time to consider an A/C maintenance plan. Our plans provide homeowners peace of mind about their system tune-ups and come with other benefits as well, such as:

  • $100 discount on system replacement (if needed) for plan A
  • $300 discount on system replacement (if needed) for plan B

You can trust our technicians with your air conditioning system no matter its current issues and rely on us for affordable, reliable diagnoses and maintenance for the life of your unit.

Contact Us for AC Replacement & Installation Services

To replace and install your A/C unit with an efficient new system, contact Design Aire today!

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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:

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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.

Contact the St. Louis & St. Charles, MO Heating & Cooling Experts

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