Quick Checks Before You Call
If those all look fine and the air still isn't cold, the problem is inside the system and needs a technician.
- Thermostat set to Cool, fan on Auto, temperature set below the room temperature
- Fresh thermostat batteries if it has them
- A clean air filter. A clogged one can freeze the coil
- Breakers for the indoor and outdoor units are on
- The outdoor unit's fan is spinning and nothing is blocking it
Why Your AC Is Running but Not Cooling
Failed capacitor
The capacitor gives the compressor and fan motor the kick they need to start. In Florida heat it's one of the most common parts to fail. Symptoms include a humming outdoor unit, a fan that won't spin, or warm air from the vents. It's usually a quick repair. See AC electrical repair.
Condenser fan not spinning
If the outdoor fan stops, the system can't release heat and the air inside gets warm. A bad fan motor or capacitor is the usual cause. See fan motor repair.
Frozen evaporator coil
Ice on the indoor coil or the copper lines blocks cooling. Causes include a dirty filter, weak airflow from the blower, or low refrigerant. Turn the system off to let it thaw and call us. Running it frozen can damage the compressor.
Low refrigerant from a leak
Air conditioners don't use up refrigerant. If it's low, there's a leak. We check the pressures and temperatures, look for the leak, and explain the repair options before recharging anything.
Dirty coils
A coil caked with dirt or algae can't move heat. This is common in our humid climate and one reason AC maintenance matters.
Thermostat problems
A miscalibrated or failing thermostat can stop calling for cooling or shut the system off too early. See thermostat repair.
How We Diagnose It
We test the electrical components, measure refrigerant pressures and the temperature drop across the coil, check airflow, and inspect both coils and the drain. You'll see what we found and get a flat-rate price before any work. The quote is free when you hire us; if you decide not to move forward, there's a $60 quote fee.
What Normal Cooling Looks Like
Before deciding something is wrong, it helps to know what a healthy system does in Central Florida heat:
- Air at the vents should feel clearly cold. A working system usually blows air roughly 15 to 20 degrees cooler than the air going into the return.
- Long run times on hot afternoons are normal. When it's 95 outside, a correctly sized system may run for long stretches. It should still pull the temperature down steadily.
- The house should feel dry, not just cool. Removing humidity is half of an air conditioner's job in Kissimmee.
- The outdoor fan should spin and blow warm air up. If the top of the condenser is quiet and still while the system runs, that's a problem.
Cool but Sticky: When Humidity Is the Problem
Sometimes the thermostat says 75 but the house feels damp and clammy. That usually means the system isn't removing moisture. Common causes are a fan setting left on On instead of Auto (which blows moisture from the wet coil back into the house), a system that's oversized and shuts off too quickly, low airflow, or a dirty coil.
High indoor humidity isn't just uncomfortable. In Florida it leads to musty smells and mold on vents and closets, so it's worth having checked.
One Room Never Cools
If most of the house is fine but one bedroom stays warm, the problem is usually airflow rather than the AC itself: a crushed or disconnected duct in the attic, a closed or blocked damper, a weak blower, or a room that simply gets hammered by the afternoon sun. We check the airflow at each vent and inspect the ducts we can reach.
One Orlando customer wrote: "Highly professional and punctual. They did a tune-up of our system and resolved an airflow issue in the master bedroom. Outstanding service and explanation." (David T., Orlando, FL)
Serving Kissimmee and Nearby Cities
We fix AC systems that aren't cooling all over Kissimmee and in nearby Orlando, Davenport and Poinciana. For other problems, visit our main AC repair page.
We Also Serve These Areas
Frequently Asked Questions
Why is my AC blowing warm air?
The most common causes are a failed capacitor, an outdoor fan that stopped spinning, a frozen coil or low refrigerant from a leak.
Can I just add refrigerant?
Low refrigerant means there's a leak. Adding refrigerant without finding the leak is a temporary fix at best. We'll explain the options.
There's ice on my AC lines. What should I do?
Turn the system off at the thermostat to let it thaw, check the filter, and call us. Running a frozen system can damage the compressor.
How long should it take my house to cool down?
On a very hot afternoon a healthy system may run for long stretches, but it should steadily bring the temperature down. If the temperature isn't dropping at all, something is wrong.
Why does my house feel cool but humid?
Often the thermostat fan is set to On instead of Auto, the system is oversized, airflow is low or the coil is dirty. Switch the fan to Auto first. If it still feels sticky, have the system checked.
Why is one room warmer than the rest of the house?
Usually an airflow problem: a crushed or disconnected duct, a blocked vent or damper, or a weak blower motor. Strong afternoon sun on that side of the house can make it worse.
Should my thermostat fan be on Auto or On?
Auto, in most Florida homes. On Auto, the fan stops with the cooling cycle so water can drain off the coil instead of being blown back into the house.
How cold should the air from my vents be?
As a rule of thumb, about 15 to 20 degrees colder than the air entering the return. If the difference is much smaller, the system isn't cooling properly.