Ductless systems
Ductless mini-split services in O'Fallon, MO
Room-by-room heating and cooling for additions, bonus rooms, garages, and older homes without ducts, installed cleanly and sized honestly for each zone.
How it works
Ductless comfort, room by room
A mini-split skips ductwork entirely: small wall-mounted heads condition individual rooms, connected to one quiet outdoor unit through a three-inch opening. Tap each numbered part to see how a ductless system, and our install process, works.
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No ductwork needed
The attic and walls stay untouched, there's no duct system at all. That's why ductless is the go-to for older St. Louis homes, additions, bonus rooms, and garages where running ducts is impractical or wasteful.
On a Swiss Air visit: We'll tell you honestly when ductless beats extending your existing ducts, and when it doesn't. See our central AC vs. ductless comparison.
How a ductless project goes
Home walkthrough
We measure the rooms you actually want to fix and check the electrical panel capacity.
Zone plan & quote
Head placement, sizing, and exact pricing per zone, before any holes are drilled.
Clean install
Mounted heads, sealed penetrations, vacuum-tested lines, and a tidy outdoor unit pad.
Zone-by-zone test
Every head is run in heating and cooling with you present, and we set up the controls together.
Keep learning
Ductless guides, no sales pitch
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How ductless works
Zoned comfort without ductwork.
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Central AC vs. ductless
Which approach fits your home?
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How heat pumps work
The technology inside every mini-split.
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Repair or replace?
An honest decision framework.
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Ductless inverter mini-split systems
The ductless equipment we install, honestly explained.
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HVAC emergency? Start here
No cooling, frozen line, what to do in the first minutes.
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
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.