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Emergency Help

Something's wrong right now? Start here.

No heat in a cold snap, no AC in a St. Louis heat wave, a gas smell at the furnace, what to do in the first minutes, what's safe to check yourself, and when to get out and call.

24/7 Emergency Line: (636) 978-7800 Book online instead

Smell gas? Carbon monoxide alarm sounding? Leave the house first.

Get everyone to fresh air, then call 911, and for a gas odor, Spire's 24-hour gas emergency line, from outside. Never search for a gas leak yourself. Call Swiss Air after you're safe, and we'll inspect the furnace before it runs again. Gas-smell steps →

Pick your situation

What's happening at your house?

Each guide covers the first minutes: what to do right away, what's safe to check yourself, and the signals that mean stop troubleshooting and call.

Do this first No heat in winter Furnace not turning on during a Missouri cold snap? Check the thermostat, power switch, breaker, filter, and blower door, in that order, before you call for repair. Do this first AC out in a heat wave AC quit during a St. Louis heat wave? Check the thermostat, breakers, filter, and outdoor unit first, and know the heat-illness signals that make this a call-now emergency. Do this first Water heater leaking Water heater leaking? Shut off the cold-water inlet first, then power or gas. What to do in the first 10 minutes, and how to tell a repairable drip from a failed tank. Leave first, 911 first Gas smell at the furnace Smell gas near the furnace? Get everyone out without touching switches, then call 911 and Spire's 24-hour gas emergency line from outside. Call Swiss Air only after you're safe. Do this first Frozen AC line Ice on your AC's refrigerant line or indoor coil? Switch cooling off, run the fan to thaw it, check the filter, and never chip the ice. Here's what the ice is telling you. Do this first Breaker keeps tripping Furnace or AC breaker keeps tripping? One reset is reasonable; repeated resets are not. What a tripping HVAC breaker means, what to check, and when it's the equipment vs. the panel.

Before the next one

Most emergencies send a warning first

These guides cover the first minutes. The pages below help you prevent the emergency altogether, and know your options calmly when it's over.

Home safety & seasonal guides CO safety, freeze protection, humidity control, season by Missouri season. Seasonal maintenance checklist Walk your system spring and fall, check items off as you go. USA Savings Club maintenance plan Priority service when something does go wrong, and tune-ups that catch failures early. Free second opinion Holding a repair quote from the emergency visit? We'll review it honestly, free.

Save our number before you need it.

Swiss Air answers 24/7 across O'Fallon, St. Charles County, and the St. Louis metro, with upfront pricing and our No Price Change Guarantee, even at 2 a.m.

Call (636) 978-7800 Book online