HVAC Services St. Louis

Design Aire has provided HVAC services in St. Louis since 1904. In that time, we have become one of the most trusted HVAC companies in the region. Our friendly team of experienced technicians is well-versed in all aspects of heating and cooling systems, from installation to repair and maintenance services.

At Design Aire, we value our clients and take great pride in the work we do for others. Our motto is the words of our founder, Frank Fischer, who stated: “Do a good job at a fair price and treat people right.” Every day, we make it our mission to uphold that motto.


Get a free a estimate or request emergency services: 314-739-1600

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Why Are HVAC Services Necessary?

HVAC systems are essential for keeping homes and businesses comfortable. They regulate temperature and can help you save on energy costs. Don’t wait for your system to break down before you call the professionals; proactive maintenance can help avoid expensive future repairs.

Design Aire’s HVAC services in St. Louis, MO, ensure your systems run correctly, efficiently, and safely.

Our HVAC Services

Our experienced technicians provide a full range of HVAC services in St. Louis, MO. We use the latest technologies to install, maintain and repair air conditioning, furnaces, and boilers. From the most straightforward repairs to complex installations, our team has the expertise and experience to do the job right.


Air Conditioning Services


Design Aire is experienced in installing and replacing cooling systems, whatever the size! Our team is well-versed in all aspects of air conditioner installation and replacement, from sizing and equipment selection to safe techniques.

Below are some signs you might need a new AC unit:

  • Airflow is limited and does not blow cold air
  • AC unit makes strange sounds
  • A foul smell comes from the AC unit
  • Energy bills have increased over time

If you need a new air conditioning unit, contact Design Aire for professional HVAC services in St. Louis, MO!


We also offer maintenance services to keep your cooling system running smoothly. We use the latest tools and techniques to diagnose problems and ensure optimal performance.

Our preventative maintenance plans help avoid unexpected breakdowns and costly repairs. Our AC maintenance checklist includes the following:

  • Inspecting and cleaning condenser coils
  • Cleaning or replacing filters
  • Adjusting and replacing fan belts
  • Checking all parts for visible wear
  • Lubricating motors and bearings as needed
  • And more!


We provide speedy repair services for all air conditioner makes and models, especially when your AC goes out on a hot Missouri day! Our technicians use advanced diagnostic equipment to swiftly locate the issue’s source and provide reliable air conditioner repair services.

Contact us as soon as possible if your AC presents any of the following:

  • Insufficient airflow
  • Loud noises or humming
  • Not turning on or irregular cycling
  • Water or refrigerant leaks
  • Drainage problems
  • Frozen AC or evaporator coil
  • And everything else in between!

Furnace Services


Design Aire installs high-efficiency furnaces in all makes and models. We understand how important it is to have a properly functioning furnace during the frigid St. Louis winters, and our technicians work quickly (and safely!) to make your home or business comfortable again.

We benefit from quantity discounts on equipment as the leading Trane dealer in the Midwest. As a result, you’ll receive exclusive offers on best-in-class Trane furnaces by choosing Design Aire.

During furnace installation, we encourage you to consider size, efficiency, blower motor type, and whether a single-stage or a two-stage system would be best.


Regular maintenance of your heating system is essential for performance and efficiency. Design Aire’s furnace maintenance services in St. Louis include the following:

  • Checking flue systems
  • Checking return air filters
  • Checking all parts for visible wear
  • Lubricating motors and bearings as needed
  • Checking gas trains and all electrical components and connections
  • Analyzing combustion and testing for carbon monoxide
  • And more!

Our preventative heating maintenance plan ensures your furnace runs smoothly. It also prevents costly repairs and downtime.


Your furnace likely needs repairing if it isn’t heating efficiently or has frequent breakdowns. Our technicians will examine the issue and provide expert solutions to get your system running again. We have experience with all makes and models and can quickly diagnose and repair your furnace system.


Boiler Services


We specialize in affordable boiler installations and replacements. Our team provides high-quality and reliable boiler installation services to ensure your new system is up and running with little-to-no downtime.


Regular maintenance is essential to ensure your boiler’s performance and longevity. Design Aire’s boiler maintenance services include:

  • Checking vent pipe and flue systems
  • Cleaning exchanger, burners, pilot, and/or ignition assembly
  • Checking expansion tank lever for a hot water system
  • Verifying proper water level
  • And more!

We offer a preventative boiler maintenance plan to certify smooth operation and avoid unexpected repairs.


If your boiler switches on and off, kettles, or makes unusual noises, it’s likely time for repair! Design Aire’s technicians will examine the issue and provide a diagnosis, then repair your boiler system as quickly as possible.


Why Choose Design Aire for HVAC Services in St. Louis?

Our commitment to customer satisfaction and respect for every client’s needs has been the foundation of Design Aire since 1904. When you choose us for your HVAC services in St. Louis or at one of our other service areas, you can trust that we’ll provide quality and reliable solutions at a fair price.

Contact us today to learn more. We look forward to serving you!

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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.

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