Our services
HVAC services in O'Fallon, MO
Swiss Air is different because we combine the trust and care of a local, family-owned HVAC company with the professionalism, responsiveness, and technical experience homeowners need when their heating or cooling system fails. We provide honest recommendations, clear options, same-day and emergency service when available, and dependable work from licensed and insured technicians without pressure, confusion, or surprises.
Our Promise
Guarantees You Can Count On
No Price Change Guarantee
The price we quote is the price you pay. No hidden fees, no mid-job upcharges.
Satisfaction Guarantee
We stand behind every job we do. If you are not completely satisfied, we will make it right, no questions asked, no hassle, no charge.
No Mess Guarantee
We leave your home cleaner than we found it, or we pay for a professional cleaning.
Same-Day Service
Comfort can't wait. Call early and we'll work to get a technician to your home the same day.
$119 diagnostic fee for a service visit — and it comes straight off your bill if you go ahead with the work.
Air Conditioning
Stay cool through Missouri summers with dependable repair, replacement, and maintenance for every major AC system.
All air conditioning servicesAC Repair
Same-day diagnostics and lasting repairs when your AC blows warm air, leaks, or won't keep up.
Learn moreAC Installation
Expert recommendations and installs for central AC, high-efficiency replacements, and system upgrades.
Learn moreAC Maintenance
Seasonal tune-ups that improve efficiency, extend equipment life, and prevent breakdowns.
Learn moreCentral AC
Service and replacement for traditional central air systems sized for your home.
Learn moreDuctless Systems
Mini-split installation and repair for zoned comfort without ductwork.
Learn more
Why homeowners choose us
- Licensed & Insured
- 24/7 Emergency Service
- Same-Day Service
- Financing Available
- Free Estimates
- 100% Satisfaction Guarantee
- Family-Owned & Operated
- 4.9 Google Rating
- Factory-Trained Technicians
- EPA Certified
Ready when you are
Contact us to schedule your service today.
Fast, professional HVAC service across O'Fallon, St. Charles County, and the surrounding St. Louis area.
Talk to a technician
Not sure what you need?
Tell us what the system is doing and we'll call you back with a straight answer — no pressure, no guesswork.
(636) 978-7800Prefer to talk now? We answer 24/7.
Tell us what's wrong
Send us the details and we'll call you back.
$119 diagnostic fee for a service visit — and it comes straight off your bill if you go ahead with the work.
Explore more
Other services and the areas we cover
Other services
Service areas we cover
- Ladue
- Town and Country
- Clayton
- Chesterfield
- Wildwood
- Creve Coeur
- Kirkwood
- Webster Groves
- Sunset Hills
- St. Albans
- Weldon Spring
- Dardenne Prairie
- Lake St. Louis
- Cottleville
- O'Fallon
- St. Charles
- St. Peters
- Wentzville
- Ballwin
- Ellisville
- Manchester
- Winchester
- New Melle
- Defiance
- Fenton
- Oakville
- Valley Park
- Twin Oaks
- Rock Hill
- Brentwood
- Richmond Heights
- Maryland Heights
- Maplewood
- University City
- Affton
- Overland
- Bridgeton
- Hazelwood
- Florissant
- St. Ann
- Charlack
- Cool Valley
- Troy
- Moscow Mills
- Old Monroe
- Winfield
- Foley
- Hawk Point
- Warrenton
- Truesdale
- Wright City
- Marthasville
- Lake Sherwood
- Foristell