Symptom guide
Common AC Problems
Residential cooling failures cluster around a short list of components. Match the symptom, understand the likely cause, and know what to expect from the repair.
Interactive diagnostic
What Is Your AC Doing?
Pick the symptom that matches your system. You will see possible causes and where to read more. This is a starting point for the conversation, not a definitive diagnosis.
AC Not Cooling
Possible causes may include:
- Restricted airflow from a loaded filter or dirty evaporator coil
- Low refrigerant charge caused by a leak
- Dirty outdoor condenser coil unable to reject heat
- A compressor that no longer pumps efficiently
Related service
AC Not Cooling Repair →Understand your cooling system
Where Systems Usually Fail
Bad capacitor
Prevents the fan or compressor from starting. Often shows up as a humming outdoor unit.
Worn contactor
Cannot reliably send power to the outdoor unit, causing intermittent operation.
Frozen evaporator coil
Usually caused by low airflow or low refrigerant, and it blocks cooling entirely.
Faulty thermostat
May misread temperature or fail to signal the system correctly.
Dirty condenser coil
Dirt and debris reduce airflow and heat rejection outdoors.
Refrigerant leak
Leads to poor cooling and can damage the compressor over time.
Dirty filter
Restricts airflow, reduces efficiency and can cause the coil to freeze.
Clogged condensate drain line
Can cause water leaks and trigger a safety shutdown.
Homeowner checklist
Before You Call
A few safe checks can save a service call, or at least give the technician a head start.
- 01
Thermostat setting
Confirm COOL mode, a setpoint below room temperature, fan on AUTO, and fresh batteries.
- 02
Air filter
Pull the filter and look at it. A gray, matted filter restricts airflow enough to cause real problems.
- 03
Breaker
Check the panel for a tripped AC breaker. Reset it once — if it trips again, leave it off.
- 04
Condensate overflow switch
Look for water in the drain pan. A float switch shutting the system down is a common cause of no cooling.
- 05
Outdoor unit
Make sure it is running, has clearance, and is not packed with grass clippings or leaves.
- 06
Supply vents
Open closed registers and move furniture away from returns so the system can move air.
- 07
Unusual sounds
Note any humming, grinding, clicking or rattling and when it happens. It speeds up diagnosis.
- 08
Visible ice
Ice on the copper line or coil means shut the cooling off and let it thaw before anything else.
Safety note: do not open electrical panels, remove the outdoor disconnect, discharge capacitors, or attempt refrigerant work. Those steps carry real shock and injury risk and belong to a trained technician.
Ready to get your cooling back?
Describe what your system is doing and get a repair estimate for your Lakeland home.