Your AC stops cooling on a 92°F afternoon in Lake Buena Vista. Before you call for emergency service — and before you wait hours in the heat — run through these five quick checks. In our experience, about one in four "emergency" calls turns out to be something the homeowner can fix in under 5 minutes at zero cost.
The 5 Quick Checks
Thermostat Setting — Is It on COOL, Not FAN?
This sounds obvious, but it's the most common call we receive. Check three things on your thermostat: (1) the mode must be set to COOL, not FAN or HEAT — FAN mode circulates air without cooling it; (2) the set temperature must be lower than the current room temperature — if the room is 76°F and you have it set to 76°F, the system correctly concludes it doesn't need to run; (3) if you have a programmable or smart thermostat, check that a schedule isn't holding the temperature higher than you expect. If any of these is wrong, correct it, wait 5 minutes, and check if cool air is coming from the vents.
Air Filter — Is It Completely Clogged?
A severely clogged air filter restricts airflow so badly that the evaporator coil freezes solid — and a frozen coil cannot cool the air passing over it. Pull your filter out and hold it up to a light. If you cannot see light through it, it's clogged. Replace it with a new filter of the same size, then turn the system to FAN ONLY (not COOL) for 1–2 hours to let the frozen coil thaw. Then switch back to COOL. In Florida, filters often need replacement every 4–6 weeks — not every 3 months as the packaging suggests. A clogged filter is also the leading cause of the musty smell many homeowners notice.
Circuit Breaker — Has the AC Breaker Tripped?
Your AC system typically uses two breakers: one for the air handler (indoor unit, usually labeled AHU, Air Handler, or Fan) and one for the condenser (outdoor unit, usually labeled AC, Condenser, or Compressor). Go to your electrical panel and look for any breaker that's in the middle position (neither fully ON nor fully OFF) — that's a tripped breaker. Reset it by pushing it fully to OFF first, then back to ON. Wait 5 minutes and try the AC again. Important: if the breaker trips again immediately, do NOT keep resetting it. A repeatedly tripping breaker means an electrical fault that needs a technician — continuing to reset it can cause a fire or compressor damage.
Outdoor Unit — Ice, Blockage, or Power Switch Off?
Go outside and look at your condenser unit. Check three things: (1) Is there ice on the unit or on the copper refrigerant lines? Ice means an airflow problem (usually the clogged filter from check #2) or low refrigerant — shut the system down and call us; running an iced system damages the compressor. (2) Is there a power disconnect switch nearby that's been switched off? Usually a gray box on the wall next to the condenser — confirm the disconnect is in the ON position. (3) Is the unit running at all? If you can hear the air handler inside but the outdoor unit is completely quiet and not spinning, the condenser has a power issue or the compressor has failed.
Vents — Are Any Closed or Blocked?
Walk through every room in the house and check all supply vents (the ones air comes out of) and return vents (the larger grilles that pull air in, usually on walls or ceilings). Closed supply vents in unused rooms create pressure imbalances that reduce airflow and cooling throughout the home. A blocked return vent — covered by a piece of furniture or curtains — starves the system of airflow and can cause the same freeze-up symptoms as a clogged filter. Make sure all vents are open and no furniture, rugs, or drapes are covering them.
In Central Florida's summer heat, if all five checks come back normal but your system still isn't cooling, the most likely culprits are: low refrigerant (slow leak), a failing capacitor (very common in FL heat), or a clogged condensate drain tripping a float switch. All three require a licensed technician. Do not delay in Florida's heat — a house that reaches 90°F is a health risk, especially for children and older adults.
When These Checks Don't Fix It: Don't Wait
If you've checked all five items above and the system still isn't cooling, it's time to call — and in Florida's heat, sooner is dramatically better than later. Here's why urgency matters:
- A home without AC in Central Florida can reach 90°F indoors within 2–3 hours on a summer afternoon
- Heat-related illness risk begins at indoor temperatures above 85°F, especially for young children, elderly adults, and pets
- Some failures (like a slowly leaking refrigerant system) get significantly more expensive the longer they run — a compressor that runs out of refrigerant will seize
- HVAC companies book up fast during heat events — calling at 3pm gives you a much better shot at same-day service than calling at 7pm
While you wait for a technician: close blinds on south and west-facing windows, run ceiling fans (they make you feel cooler even if they don't lower the temperature), and if the indoor temperature climbs above 85°F, consider taking family members or pets to an air-conditioned location.
Do not keep resetting a repeatedly tripping breaker. Do not pour water on your outdoor condenser unit to "cool it down." Do not remove the air handler cover or attempt to clean a frozen coil yourself — you need to let it thaw first. And do not add refrigerant yourself — refrigerant handling requires EPA certification and the wrong charge will destroy your compressor.
Call Lake Buena HVAC — Same-Day Service Available
Lake Buena HVAC provides emergency AC repair throughout Lake Buena Vista (32830), Kissimmee (34741), Celebration (34747), Flamingo Crossings (34787), and the Disney Springs area. Our technicians are dispatched from the local area — not a distant call center — so we can typically be on-site within 1–2 hours for emergency calls.
Call us at (321) 399-2929 — our emergency line is staffed 24/7.
Still Not Cooling? We're Available Now
Same-day service · Upfront pricing · FL Licensed & Insured · 24/7 Emergency