Why Is My AC Blowing Warm Air? Top Causes and Fixes for Lake Nona Homes
Your AC Is Blowing Warm Air – Here Is What to Check
Few things are more frustrating than your AC running all day but blowing warm or lukewarm air in the middle of a Lake Nona summer. Before calling for a service appointment, there are several things you can check yourself that may solve the problem without a service call.
Check These First (Free Fixes)
1. Check Your Thermostat Settings
It sounds obvious, but we get calls every week where the thermostat was accidentally switched to HEAT mode or the fan was set to ON instead of AUTO. When the fan is set to ON, it runs continuously even when the compressor is not cooling, which can feel like warm air. Switch it to AUTO and COOL mode first.
2. Check Your Air Filter
A clogged air filter is the number one cause of AC problems in Florida. When the filter is blocked, airflow is restricted across the evaporator coil, causing it to freeze up. Once the coil freezes, the system blows warm air. Check your filter and replace it if it is dirty. In Lake Nona, we recommend replacing filters every 30 to 60 days during summer due to high pollen counts and dust.
3. Check Your Circuit Breaker
Your AC system has two breakers, one for the indoor air handler and one for the outdoor condenser. If the outdoor breaker has tripped, the indoor fan will still blow air, but it will not be cooled. Check your electrical panel and reset any tripped breakers.
Common Professional Repairs Needed
Low Refrigerant ($150-$400)
If your system is low on refrigerant, it cannot cool effectively. Refrigerant does not get used up like fuel. If it is low, you have a leak that needs to be found and repaired. We use electronic leak detection to find even small leaks, then repair and recharge your system.
Frozen Evaporator Coil ($150-$350)
A frozen coil is usually caused by restricted airflow (dirty filter, blocked vents) or low refrigerant. If you see ice on the copper lines going to your indoor unit, turn the system off and let it thaw for 2 to 4 hours. If the problem returns after replacing your filter, call for professional service.
Dirty Condenser Coil ($100-$250)
Your outdoor unit condenser coil gets clogged with dirt, grass clippings, and debris over time, reducing its ability to release heat. We recommend annual condenser coil cleaning as part of regular maintenance. You can help by keeping 2 feet of clearance around your outdoor unit.
Failing Compressor ($300-$1,200)
The compressor is the most expensive component in your AC system. If it is failing, the system cannot compress refrigerant to cool your home. A failing compressor often makes unusual clicking or humming sounds when trying to start. For older systems, compressor failure often means it is time to consider full system replacement.
When to Call a Professional
If the free fixes above do not solve your warm air problem, or if you notice ice forming on your AC lines, unusual sounds from the outdoor unit, your breaker keeps tripping after being reset, or a burning or chemical smell, call Lake Nona AC Repair. We provide same-day emergency service throughout Lake Nona, Laureate Park, Beacon Park, and surrounding 32827/32832 communities.