AC Not Cooling? Here’s What Could Be Wrong and How to Fix It

Nothing is worse than an air conditioner that suddenly stops working when you need it most. If your system won’t start, blows hot air, or makes loud noises, it’s important to pinpoint the issue quickly so you can bring comfort back to your home.

1. Clear Signs Your AC Is Failing

Not sure if your air conditioner needs attention? Watch for these red flags:

• Vents pushing out warm or room-temperature air
• Little to no airflow inside your rooms
• AC cycling on and off more often than normal
• Strange sounds like grinding, squealing, or banging
• Strong, musty, or burning odors
• Water leaks or condensation around the unit

2. Top Reasons Your AC Won’t Work Properly

Air conditioners can break down for many reasons. The most frequent problems include:

Thermostat Malfunctions

A faulty thermostat or incorrect settings can stop your system from cooling your home efficiently—or from turning on at all.

Clogged Air Filters

Dirty filters block airflow, forcing your unit to overwork and sometimes causing it to shut down.

Low Refrigerant

If refrigerant is leaking, your AC can’t absorb heat properly, which often leads to warm air and possible compressor damage.

Electrical Failures

Blown fuses, tripped breakers, or damaged wiring can completely cut power to your cooling system.

Frozen Coils

When coils ice up due to airflow restrictions or low refrigerant, cooling stops altogether.

Broken Compressor

The compressor powers the entire system. If it fails, the AC can’t cool at all and usually needs professional repair or replacement.

3. Quick Fixes to Try Before Calling a Pro

Sometimes the solution is simple. Try these basic steps first:

1. Double-check thermostat settings and replace batteries if needed.
2. Swap out old or dirty air filters.
3. Inspect your breaker box for tripped switches.
4. Look for ice, leaks, or odd noises around the unit.
5. Make sure the outdoor unit isn’t blocked by debris, dirt, or leaves.

4. When It’s Time to Call an HVAC Technician

Not every AC issue is DIY-friendly. Call a professional if:

• Your system won’t power on at all
• You notice a refrigerant leak
• The unit makes loud banging or grinding noises
• The AC keeps shutting off quickly (short cycling)
• Warm air persists even after troubleshooting

5. How to Prevent AC Problems in the Future

Routine care is the key to keeping your AC reliable year after year:

• Replace filters every 30–90 days
• Schedule a yearly HVAC inspection and tune-up
• Keep the outside condenser clean and clear of obstructions
• Check thermostat operation regularly