7 Warning Signs Your AC Needs Repair

Don't Wait for a Complete Breakdown

Your AC system often shows warning signs before a major failure. Recognizing these signs early can mean the difference between a minor repair and an expensive replacement.

1. Weak or Reduced Airflow

If you notice less air coming from your vents, it could indicate:

• Clogged air filter
• Ductwork problems
• Failing blower motor
• Frozen evaporator coil

What to do: Check and replace your filter first. If airflow doesn't improve, call for service.

2. Warm Air When Set to Cool

When your AC runs but blows warm air:

• Thermostat might be set incorrectly
• Refrigerant could be low (leak)
• Compressor may be failing
• Outdoor unit might be blocked

What to do: Check thermostat settings. If correct, this needs professional diagnosis.

3. Unusual Noises

Different sounds indicate different problems:

• Grinding: Motor bearings failing
• Squealing: Belt slipping
• Banging: Loose or broken component
• Clicking: Electrical issues
• Hissing: Refrigerant leak

What to do: Turn off the system and call for repair. Continuing to run it can cause more damage.

4. Bad Odors

• Musty smell: Mold in ductwork or drain pan
• Burning smell: Electrical problem or overheating
• Rotten egg smell: Dead animal in ductwork (or gas leak if you have gas appliances)

What to do: Musty smells need cleaning. Burning smells require immediate shutoff and professional inspection.

5. High Humidity Indoors

Your AC should remove humidity. If your home feels sticky:

• System may be oversized (cools too quickly to dehumidify)
• Evaporator coil might be dirty
• Refrigerant could be low

What to do: Call for a system check and possible dehumidification solutions.

6. Short Cycling

If your AC turns on and off every few minutes:

• Thermostat could be malfunctioning
• System might be overheating
• Refrigerant could be low
• Unit may be oversized

What to do: This causes high wear and energy bills. Call for diagnosis soon.

7. Higher Than Normal Energy Bills

A sudden spike in cooling costs often indicates:

• Refrigerant leak
• Dirty coils reducing efficiency
• Aging equipment losing efficiency
• Ductwork leaks

What to do: Compare bills year-over-year. If costs jump more than 10-15%, schedule an inspection.

The Bottom Line

Catching problems early typically costs $100-300 for repairs versus $3,000-8,000+ for replacements. When you notice any of these signs, don't wait.