In this article
The short answer: air or refrigerant isn't moving
When the AC runs and runs but the house stays warm, the system is losing the fight in one of two places: it can't move enough air (filter, coil, blower, or ducts), or it can't move enough heat (refrigerant or compressor). Almost every "running but not cooling" call we take in South Florida comes down to one of those — and most of them are repairs, not replacements.
The good news: the most common causes are also the least expensive ones. A clogged filter or a dirty coil can make a healthy system look dead. Start with the simple checks below before anyone talks you into a new unit.
The usual causes we find
- A clogged air filter. The cheapest cause and the most common. A strangled system can't move air across the coil, cooling collapses, and in bad cases the coil freezes solid.
- A dirty evaporator coil. The coil is where heat leaves your home's air. Coat it in buildup and it can't absorb heat — the air comes out weak and barely cool.
- Low refrigerant. Usually means a leak. The system runs longer and cools less, and simply "topping it off" without finding the leak is a bill you'll pay again next season.
- Leaking or disconnected ducts. Cooled air spills into the attic instead of reaching your rooms. The house never catches up, and your electric bill shows it.
- A failing blower or capacitor. Airflow at the vents turns weak even though the system sounds like it's working.
- An aging compressor or a genuinely undersized system. It happens — but it should be the last conclusion, not the first sales pitch.
What you can check yourself
- Replace the filter. Start here — it's the cheapest fix in the house, and it solves more "not cooling" calls than you'd believe.
- Check the thermostat. Set it to Cool, the fan to Auto, and a few degrees below the room temperature. If it runs on batteries, try fresh ones.
- Feel the vents. Air that's weak, air that's warm, and no air at all point to three different problems — noticing which one you have helps any technician.
- Look at the outdoor unit. The fan should be spinning when the system calls for cooling. Clear leaves and debris away from it and keep a couple of feet of breathing room around it.
- Check for ice. Ice on the indoor coil or the copper lines means airflow or refrigerant trouble. Turn the system off, set the fan to On to thaw it, and don't keep running it frozen.
- Peek at the drain line. In Florida humidity, algae clogs condensate drains fast. A tripped float switch can stop cooling entirely — and it looks exactly like a broken AC.
When to call a professional
Call when a fresh filter doesn't fix it — especially if the system runs for hours without reaching the set temperature, the vents blow warm, ice keeps coming back, there's water around the air handler, or your bills are climbing while comfort drops. Those are diagnosis problems, and they're solved by looking inside the system, not by guessing parts from the thermostat.
What our inspection covers
Our free inspection follows the whole path: the filter, the evaporator coil, the blower, a hands-on look inside the ductwork, airflow at the vents, and the outdoor unit. Then we show you what we found and give you one exact price in writing before any work begins — only for what your home actually needs. If the problem turns out to be something small, we'll tell you that too.
Frequently asked questions
Why is my AC running but not cooling?
Start with the simple checks: a clogged filter and a dirty evaporator coil are the two most common causes we find, because both stop the system from moving and cooling air the way it should. If the filter is fresh and the air still comes out weak or warm, the cause is more likely mechanical — low refrigerant, a failing blower, or a struggling compressor — and that needs a proper diagnosis, not a guess. We inspect first, show you the problem, and give you one exact price in writing before any repair begins. Call (954) 687-9356 and we'll come take a look.
Why is my AC blowing warm air?
Warm air usually means the system is moving air but not removing heat: a dirty coil that can't absorb heat, low refrigerant from a leak, or an outdoor unit whose compressor isn't running. Check that the outdoor fan is spinning and the filter is clean; if both are fine, it needs a real diagnosis — guessing at parts gets expensive fast. We inspect first, show you the problem, and give you one exact price in writing before any repair.
Why does my AC run all day and never reach the temperature I set?
A system that never catches up is losing cooled air or cooling power somewhere: ducts leaking into the attic, a clogged filter or dirty coil restricting airflow, low refrigerant — or, in the worst case, a system that's too small or wearing out. In Florida heat a healthy system should cycle off during the day; one that runs nonstop is also running up your electric bill. An inspection finds which one it is before you spend on the wrong fix.
Why is my AC leaking water inside the house?
Usually a clogged condensate drain line — algae and slime build up in Florida's humidity until the water backs up and overflows the drain pan. Many systems have a float switch that shuts cooling off when that happens, which is why a water problem can look like a cooling problem. Clearing the line is a small job; ignoring it can mean ceiling and floor damage. If you see water around the air handler, turn the system off and call us at (954) 687-9356.
Why is the airflow from my vents so weak?
Weak airflow means air is being blocked or lost on its way to you: a clogged filter, a dirty coil or blower, a crushed or disconnected duct run, or ducts leaking into the attic. Hold your hand at a few vents — if some are strong and others barely breathe, the problem is in that duct run; if all of them are weak, it's at the equipment. Either way it's diagnosable in one inspection, and the price is exact before any work begins.