The St. Louis metro
HVAC service across St. Charles County and Greater St. Louis
Swiss Air is an O'Fallon, Missouri HVAC company, and St. Charles County is where we started in 1989. But the St. Louis metro is one housing market, not two, and we service heating and cooling across both sides of it — St. Charles County, St. Louis County, St. Louis City, and the Lincoln and Warren County towns out west.
That matters more than a list of city names suggests. A 1920s brick two-story in Webster Groves, a 1990s subdivision home in O'Fallon, and a 2020 build in Wentzville each ask something different of an air conditioner and a furnace: different duct realities, different electrical service, different fuel options, and different permit paths depending on which county and municipality the house sits in. We size, diagnose, and pull permits for the house in front of us.
St. Charles County
O'Fallon, St. Peters, St. Charles, Lake St. Louis, Wentzville, Cottleville, Dardenne Prairie, Weldon Spring, New Melle, Defiance, Portage Des Sioux, Augusta
Home base. Mostly newer construction — 1980s subdivisions through current builds — which means ducted forced-air systems, natural gas where the main reaches and propane where it doesn't, and a lot of original equipment now hitting replacement age all at once. Permits run through the county or the municipality depending on the address, and we handle that paperwork as part of a replacement.
West St. Louis County
Chesterfield, Creve Coeur, Maryland Heights, Ballwin, Town and Country, Valley Park, Fenton, Eureka, Wildwood
Larger homes, more two-stage and variable-speed equipment, and more zoned systems than St. Charles County. Zoning problems here are usually control or damper faults rather than a failed air conditioner, so the diagnosis starts with which zone is misbehaving and when.
Mid-County and inner-ring suburbs
Kirkwood, Webster Groves, Clayton, University City, Richmond Heights, Brentwood, Ladue, Olivette
Older housing stock — pre-war brick homes, additions layered over decades, converted attics and basements, and ductwork that was never designed for the way the house is used today. Room-to-room temperature complaints here are far more often an airflow and duct problem than a broken system, and replacing equipment without fixing the airflow just makes a quieter version of the same complaint.
North County
Florissant, Hazelwood, Bridgeton, Berkeley, Ferguson, St. Ann, Overland, Black Jack, Spanish Lake, Earth City
Mid-century ranches and split-levels, many with original ductwork and undersized returns. Straightforward systems, generally, but they reward correct sizing: an oversized replacement in a 1,200-square-foot ranch short-cycles and leaves humidity behind all summer.
St. Louis City
City neighborhoods across the south side, central corridor, and north side, including the historic brick districts
Century-old brick homes, tight lots, retrofitted systems, and mechanical spaces that were never planned as mechanical spaces. Ductless mini-splits often solve what a ducted system can't reach here, and condenser placement is a real design question rather than an afterthought.
Lincoln, Warren, and Franklin County corridor
Troy, Moscow Mills, Foristell, Warrenton, Pacific
More propane and all-electric homes than the inner metro, larger lots, and outbuildings that owners want conditioned. Fuel type drives the recommendation here more than anywhere else in our service area — heat pumps and dual-fuel pairings frequently win on operating cost where natural gas isn't available.