9 Expert Solutions for When Your | Air Conditioner Isn't Cooling

Check Your Thermostat Settings

We’ll start with the basics. Your thermostat is the command center of your cooling system, and sometimes, the solution is as simple as a misplaced setting.

• • Ensure your thermostat is set to “Cool” mode.
  • Set the temperature a few degrees lower than the current room temperature.
  • If your thermostat is battery-operated, replace the batteries to rule out power issues.

Inspect and Clean the Air Filter

Your air filter tirelessly traps dust. But when it becomes clogged your AC struggles to push cool air through.

• • Locate your air filter (usually found in the return air duct or the indoor unit).
  • If it’s reusable, give it a thorough clean with warm, soapy water.
  • If it’s disposable, replace it with a new one.

Pro tip: Mark your calendar to check your filter every 1-3 months. Your AC will thank you with enhanced performance and energy efficiency!

Clear Obstructions Around the Outdoor Unit

Your AC’s outdoor unit needs its personal space to function optimally.

• • Remove any leaves, branches, or overgrown vegetation within a 2-foot radius of the unit.
  • There should be no objects blocking the airflow on top of the unit.
  • Consider trimming nearby bushes or trees to maintain clearance year-round.

Clean the Condenser Coils

The condenser coils are like the lungs of your AC system. When they’re coated in dirt, your AC can’t exhale hot air effectively, leaving you with a less-than-cool home.

• • Gently clean the coils with a soft brush to remove loose debris.
  • For stubborn grime, use a commercial coil cleaner or a mixture of mild dish soap and water.
  • Rinse thoroughly and allow to dry completely before restarting your AC.

Investigate Refrigerant Leaks

Low levels of refrigerant can leave your AC gasping for coolness.

• • Look for signs of leaks, such as ice buildup on refrigerant lines or hissing sounds.
  • Check for oil stains around connections, which can indicate a leak.

Caution: Refrigerant can be dangerous. If you suspect a leak, call in the pros for a safe and effective solution.

Examine the Condensate Drain

• • Locate the drain line (usually a PVC pipe near the outdoor unit).
  • Clear any visible blockages with a wet/dry vacuum or a stiff wire brush.
  • Pour a cup of white vinegar down the drain annually to prevent algae growth.

Inspect the Compressor and Fan

The compressor and fan are the dynamic duo of your AC system. If either is out of sync, your cooling suffers.

• • Listen for unusual noises or vibrations when your AC is running.
  • Ensure the outdoor fan is spinning when the AC is on.
  • Check for any visible damage or loose connections.

Check for Duct Leaks

• • Inspect visible ductwork for holes, gaps, or disconnected sections.
  • Use duct tape or mastic sealant to patch small leaks.
  • For extensive duct issues, consider professional duct sealing services.

Verify Proper AC Unit Sizing

Sometimes, the issue isn’t with your AC’s performance, but its size. An undersized unit will struggle to cool your space.

• • Consider the square footage of your home and your typical cooling needs.
  • Consult with a professional to determine if your unit is appropriately sized.
  • If undersized, discuss options for supplemental cooling or system replacement.