Frequently asked questions

Swiss Air Heating & Cooling serves O'Fallon, St. Charles County, and communities across the greater St. Louis metro, including Chesterfield, St. Peters, Wentzville, Florissant, Kirkwood, and dozens of surrounding cities. Visit our Service Areas page for the full list.

Yes. We are a licensed and insured HVAC contractor in Missouri. Our technicians are EPA certified, factory trained on major equipment brands, and background checked, so you get professional work from a team you can trust in your home.

Absolutely. We are a family-owned heating and cooling company that has served the O'Fallon area since 1989. You will speak with real people who know the community, not a distant call center.

Yes. When your heat or air conditioning fails at the worst time, we offer 24/7 emergency service. Call us and we will do everything we can to get a qualified technician to your home as quickly as possible.

We recommend professional maintenance at least once a year, ideally before cooling season for your air conditioner and before heating season for your furnace. Regular tune-ups improve efficiency, catch small problems early, and help your equipment last longer.

Consider replacement when your system is 12 to 15+ years old, needs frequent repairs, cannot keep your home comfortable, or your energy bills keep climbing. Our technicians will give you honest options, repair when it makes sense, replace when it saves you money and stress long term.

We install and service leading brands including Trane and other major manufacturers. Whether you need a new high-efficiency system or service on your existing unit, our factory-trained team can help you choose equipment that fits your home and budget.

Common causes include a dirty filter, low refrigerant, a frozen coil, a failing capacitor, or thermostat issues. Turn the system off if you see ice on the unit, check your filter, and call us, we will diagnose the problem and restore your comfort.

The right size depends on square footage, insulation, windows, ductwork, and how your home is used. Oversized or undersized equipment wastes energy and shortens comfort. We perform a proper load evaluation before recommending replacement equipment.

In many cases, yes. Same-day service is available when our schedule allows. Call as early as you can and we will work to get a technician to your home quickly, especially for no-heat and no-cool emergencies.

Our maintenance plans include scheduled tune-ups for your heating and cooling equipment, priority scheduling, and proactive inspections designed to reduce breakdowns. Members enjoy peace of mind knowing their system is cared for by the same local team year round.

Yes. In addition to heating and air conditioning, we help with water heater repair, replacement, and related plumbing needs. If your hot water is unreliable or your unit is aging, we can walk you through repair vs. replacement options.

Options include high-efficiency filtration, whole-home air purifiers, humidifiers, duct sealing, and regular system maintenance. Tell us about allergies, odors, or dust concerns and we will recommend practical upgrades for your home.

Yes. We provide free estimates for system replacements and larger projects. You will get clear options and honest recommendations, no pressure and no surprises.

Yes. Flexible financing is available for qualified customers on qualifying equipment and projects. Ask our team about payment options when you schedule your estimate or service visit.

A uniformed Swiss Air team member will introduce themselves, protect your home, diagnose the issue, and explain your options before work begins. We believe in transparent communication, you approve the plan before we proceed.

Call (636) 978-7800, use our contact form, or request service online. A member of our local team will confirm your appointment and answer any questions about timing, pricing, or what to expect.

Yes. Our home base is O'Fallon, MO, and we regularly serve homeowners throughout St. Charles County, St. Louis County, and nearby communities. If you are unsure whether we cover your address, call us, we are happy to confirm.

Service call and diagnostic fees depend on the type of visit and time of day. We will explain any applicable fees up front when you schedule, so you know what to expect before a technician is dispatched.