Why Is My AC Running but Not Cooling? A Boca Raton Guide
By Direct Cooling Team ·
Few things are more frustrating in a South Florida summer than an air conditioner that runs all day while the house keeps getting warmer. The good news: when an AC runs but does not cool, the cause is usually one of a short list of problems, and several are simple to check before you call anyone.
Start With the Easy Checks
Thermostat. Confirm it is set to Cool, the set temperature is below the room temperature, and the fan is on Auto rather than On. With the fan on On, the blower keeps moving air even when the system is not cooling, which can feel like a failure.
Air filter. A clogged filter chokes airflow across the indoor coil. In Florida, standard filters often need changing every 30 to 60 days. If yours is gray and matted, replace it.
Breakers and the outdoor unit. Walk outside. If the indoor fan runs but the outdoor fan and compressor are silent, check the breaker and the disconnect switch near the unit. Do not reset a breaker that trips again immediately; that points to an electrical fault.
The Common Causes We Find
A failed capacitor or contactor
This is the most common reason an outdoor unit stops running while the indoor blower keeps going. Capacitors give the compressor and fan motor the boost they need to start, and Florida heat wears them out. You may hear a hum from the outdoor unit with the fan not spinning. A technician can test and replace a capacitor safely; it stores a charge, so it is not a do-it-yourself part.
A dirty or frozen evaporator coil
Restricted airflow or low refrigerant can cause the indoor coil to ice over. Ice blocks airflow, so the system runs and runs without cooling. If you see ice on the refrigerant lines or the indoor unit, turn the system off and let it thaw, then call for service. Running a frozen system can damage the compressor.
Low refrigerant from a leak
Air conditioners do not use up refrigerant. If it is low, there is a leak. Topping it off without finding the leak only delays the next breakdown. With the industry moving from R-410A to A2L refrigerants, the repair-versus-replace decision for a leaking older system deserves a straight answer, and we give one.
A dirty condenser coil
The outdoor coil releases the heat pulled from your home. Grass clippings, dirt and, near the coast, salt buildup make that harder, and the system loses capacity on the hottest days.
A clogged condensate drain
Many systems have a float switch that shuts the outdoor unit off when the drain backs up, to prevent water damage. The blower may keep running, so it looks like the AC is on but not cooling. Algae in the drain line is extremely common in South Florida.
An undersized or aging system
Sometimes nothing is broken. A system that was undersized, or one that has lost efficiency with age, may simply not keep up on a 95 degree afternoon. An evaluation of the load and the equipment tells you whether a repair, a tune-up or a replacement makes sense.
When to Call a Professional
Call if the outdoor unit is not running, you see ice, the breaker trips, you hear grinding or buzzing, or the easy checks above do not fix it. Direct Cooling diagnoses first and recommends a repair whenever a repair is the right call.
In Boca Raton, Delray Beach, Boynton Beach, Deerfield Beach, Parkland or Coral Springs, call or text (561) 210-7605. Our dispatch line is monitored 24/7.
How to Prevent It Next Summer
Twice-a-year maintenance clears the drain, cleans the coils and tests the capacitor and contactor before they fail. Our membership plan includes both tune-ups plus 10% off any repair you do need.