Step-by-step guidance for KC homeowners — from the moment it stops cooling to getting a technician to your door fast.
It happens every summer in Kansas City. The temperature pushes past 100°F, the humidity makes it feel like 110°F, and your AC — the one thing standing between you and a miserable evening — stops working.
Don’t panic. Most AC failures during a heat wave follow a predictable pattern, and there are several things you can check yourself before calling for service. This guide walks you through exactly what to do, in the right order, so you’re not waiting helplessly while your house heats up.
Heat-related illness can set in quickly in an enclosed home during extreme heat. If anyone in your household is elderly, very young, or has a medical condition, don’t wait it out — get them somewhere cool (a neighbor’s, a library, a mall) while you troubleshoot.
Step 1: Check the thermostat first
It sounds obvious, but the thermostat is the source of more “AC failures” than any actual equipment problem. Before anything else:
- Make sure it’s set to “Cool” — not “Fan Only” or “Heat”
- Confirm the set temperature is below your current room temperature
- Replace the batteries if the display looks dim or unresponsive
- If it’s a smart thermostat, check whether it lost its Wi-Fi connection and reset if needed
If the thermostat looks fine and the system still won’t respond, move to the next step.
Step 2: Check your circuit breaker
AC units draw a significant amount of power — especially on hot days when they’re running hard. A tripped breaker is one of the most common causes of a sudden shutdown.
What to do: Go to your electrical panel and look for a breaker labeled “AC,” “Air Conditioner,” or “HVAC.” A tripped breaker will be in the middle position between ON and OFF. Switch it fully OFF first, then back ON.
Important: If the breaker trips again immediately or repeatedly, stop resetting it. A breaker that keeps tripping is telling you there’s an electrical fault — possibly a failing capacitor, a short, or an overloaded compressor. Continuing to reset it can cause serious damage. Call a technician.
Step 3: Check the air filter and vents
A severely clogged filter can cause your evaporator coil to freeze over, which shuts down airflow completely and can make it seem like the system has failed entirely.
What to check: Pull your filter. If it’s packed with dust and debris, replace it immediately. Then check several supply vents around the house — if airflow feels weak or nonexistent from most of them, a frozen coil may be the culprit.
If you suspect a frozen coil: Turn the system off and switch the fan to “On” (not “Auto”) to circulate air over the coil and help it thaw. This can take 1–3 hours. Once thawed, replace the filter and try restarting. If it freezes again, you have an underlying issue — low refrigerant or an airflow problem — that needs a technician.
Step 4: Check the outdoor unit
Head outside and look at your condenser unit. Is it running? You should hear the fan and feel warm air being expelled from the top.
- If the fan isn’t spinning but you can hear a humming sound, the capacitor may have failed — a very common summer failure that a technician can fix quickly
- If the unit is completely silent and there’s no power to it, check the disconnect box mounted on the wall near the unit — the disconnect may have been pulled or blown
- If the unit is running but the air coming out doesn’t feel warm, the refrigerant may be low
- If the unit is encased in ice, you have a frozen coil situation — see Step 3
Leave alone: Refrigerant lines, electrical components, and anything inside the unit cabinet. These require a licensed HVAC technician — both for safety and because handling refrigerant without certification is illegal.
Step 5: Call for emergency AC service
If you’ve worked through the steps above and the system still isn’t cooling, it’s time to call a professional. Here’s how to get help as fast as possible on a hot KC day:
- Call early in the morning if possible — by midday on a 100°F day, every HVAC company in the metro is slammed
- When you call, have your system’s age, brand, and any symptoms ready — this helps the dispatcher prioritize and send the right technician
- Ask specifically about same-day emergency availability and after-hours rates so there are no surprises
- While you wait, close blinds and curtains on sun-facing windows, use ceiling fans on the counterclockwise setting to create a cooling effect, and move to your lowest floor where heat rises away from you
LBA Services offers service 365 days a year across the Kansas City metro — including Mission, KS and Lee’s Summit, MO. If your AC is down, call (913) 268-6822 now. We’ll tell you our earliest availability and get a technician to you as fast as possible.
What the technician will likely find
The majority of summer AC failures in Kansas City come down to a short list of culprits. Knowing what’s likely ahead of time helps you understand the repair and make a confident decision:
Failed capacitor: The most common summer failure. Capacitors help start and run your compressor and fan motors. They degrade over time and often fail on the hottest days when the system is under maximum load. Replacement is typically fast and affordable.
Low refrigerant: If your system is low on refrigerant, it has a leak. Simply recharging it without finding and fixing the leak is a temporary fix — and environmental regulations require leak repairs before recharging. Expect a leak search, repair, and recharge.
Frozen evaporator coil: Usually caused by a dirty filter or low refrigerant. Once the coil thaws, the technician will identify and fix the root cause.
Failed contactor: The contactor is an electrical switch that sends power to the compressor. It wears out over time and is a common fix on older systems.
Compressor failure: The most serious and expensive failure. On a system over 10–12 years old, a failed compressor often makes replacement more cost-effective than repair. A good technician will walk you through both options honestly.
Repair or replace? The honest answer
If your system is under 10 years old and the repair is under $500, repair almost always makes sense. If your system is 12–15+ years old and you’re looking at a major repair — compressor, condenser, or refrigerant system — the math often favors replacement, especially given the efficiency gains of modern systems.
The rule of thumb: multiply the repair cost by the system’s age. If the result exceeds $5,000, replacement is worth a serious look. A reputable technician should walk you through this without pressure — if someone is pushing you toward a $10,000 replacement on a 6-year-old system with a $300 capacitor issue, get a second opinion.
Frequently asked questions
How long will I wait for emergency AC service in Kansas City?
On an extreme heat day, same-day service can be 4–8 hours or more at peak times. Calling as early as possible — even before the house is unbearably hot — significantly improves your wait time. LBA’s 365-day availability helps, but demand on 100°F days is high across the entire metro.
Can I run my AC if it’s not cooling well?
It depends on why. If it’s just blowing warm air (low refrigerant, dirty coil), running it won’t cause immediate harm but won’t help either. If you suspect a frozen coil, turn it off — running a system with a frozen coil can damage the compressor. When in doubt, shut it down and call.
Is it safe to sleep in a hot house overnight?
For healthy adults, a few uncomfortable nights in a home up to the mid-80s°F is unpleasant but not dangerous. For elderly adults, infants, and people with heart or respiratory conditions, sustained indoor heat above 80°F carries real health risk. Don’t tough it out in those cases — find somewhere cool to sleep.
How do I prevent this from happening next summer?
Annual pre-season tune-ups catch the components most likely to fail — capacitors, contactors, refrigerant levels — before they strand you in a heat wave. Scheduling a tune-up every spring in Kansas City is the single most effective thing you can do to avoid emergency calls in July and August.
