8 Common Air Conditioner Problems and Fixes

On February 25, 2026  By newsroom   Topic: Appliance Buyers Guide

General Issues

Dirty Filter:
- A clogged filter reduces cooling efficiency.
- Fix: Clean or replace filters regularly (every 3–12 months for central AC; more often with pets or heavy use).


Window AC Issues

Too Much Sunlight:
- Direct sunlight makes the AC work harder.
- Fix: Move the unit to a shaded window or keep curtains drawn during the day.

Air Leaks:
- Gaps around the unit let hot air in and cool air out.
- Fix: Use weatherstripping and insulation panels to seal gaps.

Vibration Noises:
- Misalignment during installation can cause vibrations.
- Fix: Ensure the unit is securely mounted and review installation instructions.


Central AC Issues

Thermostat Issues:
- Direct sunlight on the thermostat can cause incorrect readings.
- Fix: Relocate the thermostat or block direct sunlight.

Blocked or Dirty Registers:
- Dust buildup and furniture can obstruct airflow.
- Fix: Vacuum registers regularly and clear obstructions.

Crowded Compressor:
- Plants or objects too close to the outdoor unit restrict airflow.
- Fix: Maintain 2–3 feet of clearance around the unit and 5 feet above.

Skipping Annual Maintenance:
- Lack of professional servicing can lead to major issues.
- Fix: Schedule yearly inspections to check refrigerant levels and moving parts.


When to Replace Your Window AC

  • Small Rooms (100–250 sq. ft.): 5,000–6,500 Btu.
  • Midsized Rooms (250–350 sq. ft.): 7,000–8,500 Btu.
  • Large Rooms (350–550 sq. ft.): 9,800–12,500 Btu.
  • Look for models with good noise and comfort ratings.

Maintenance Tips

  • Clean filters, check seals, and ensure proper installation.
  • Routine maintenance ensures cool, efficient air all summer long!

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