AC not cooling or stopped in Miami-Dade

A dead air conditioner in Miami is not a comfort problem; by the second hour the house is 85° and climbing. This is the call we route fastest. Describe what the system is doing and a local contractor calls you back to set the visit.

Before you call, three checks take two minutes and sometimes end the emergency: the breaker, the thermostat, and the filter. The rest is below.

Check these first

• Breaker: find the AC breakers in the panel (usually two, one for the air handler and one for the condenser) and see whether either has tripped. Reset once. If it trips again, stop and call; something is drawing too much current.
• Thermostat: set to Cool, temperature below room temperature, batteries fresh if it takes them. A blank screen usually means a tripped float switch or a dead transformer, both contractor jobs.
• Filter: a filter clogged solid will freeze a coil and shut the system down. Replace it and let the system rest an hour before trying again.
• Ice on the copper lines or the coil: turn the system off at the thermostat (fan On is fine). It has to thaw before anyone can diagnose it, and running it frozen can kill the compressor.
• Water at the air handler: the condensate drain is clogged and the float switch has cut the system off. That is the single most common Miami shutdown and a quick fix for the tech.

What usually happened

On the hottest days, the failure is most often electrical: a swollen capacitor or a burnt contactor on the outdoor unit. The fan spins but the compressor hums and never starts, or nothing outside runs at all. These are inexpensive repairs a contractor fixes on the first visit when they carry the part.

Warm air with everything running points to refrigerant: a leak in the evaporator coil or a line set, which in humid Miami air shows up as ice first. Repairing the leak and recharging is the fix when the system is worth it; a leaking coil on a fifteen-year-old system starts the replacement conversation.

A system that starts, runs a minute, and shuts down is short-cycling: a float switch, a pressure switch, a failing thermostat, or an oversized unit. Each has a different fix, and the contractor needs to see it run.

While you wait

Close blinds on the sun side, run ceiling fans, and keep the doors closed. If someone in the house is elderly, very young, or unwell, do not wait it out in an 88° house; a friend's place or a cooling center is the right call while the visit is scheduled.