air conditioner not blowing cold air

Why Is My Air Conditioner Not Blowing Cold Air?



There’s hardly a worse feeling on a hot day than reaching for your thermostat only to find your air conditioner blowing cold air. This is a common problem many homeowners face, and while the reasons can vary, most are fixable with a bit of know-how. If you’ve caught yourself thinking, “Why is my AC running but not cooling?”, we’re here to help!

Understanding the Issue: Air Conditioner Not Blowing Cold Air

The journey to restoring your home’s cool comfort often starts with understanding what might be going awry. Various factors could be at play, and by identifying them, you can either fix the issue or at least know when it’s time to call a professional.

Air Conditioner Not Getting Power

Air conditioners are like any other electronic appliance; they need power to function. If there’s a disruption in the power source, your A/C unit simply won’t work.

  • Tripped Circuit Breaker: Sometimes, the breaker connected to the A/C unit can trip, especially if there’s an overload. When this happens, power to the unit is cut off. You can easily check the circuit breaker panel in your home and look for any switches that aren’t aligned with the rest. Flip the switch back to its original position and try running your A/C again.
  • Blown Fuse: Fuses act as a protective barrier against electrical overloads. If the fuse connected to your air conditioner blows, the unit won’t receive power. If you’re comfortable doing so, inspect the fuse box or consider replacing the fuse. However, repeated fuse issues might indicate a deeper electrical problem.
  • Faulty Wiring: Electrical issues, particularly faulty wiring, can prevent the A/C unit from getting power. If you’ve ruled out the breaker and fuse as culprits, it might be time to call a professional to inspect your wiring.

Thermostat Calibration and Troubles

Your thermostat is like the control center of your air conditioning system. If it’s not working correctly, it won’t send the right signals to your A/C unit, leading to issues like the air conditioner running but not cooling the house.

  • Improper Settings: It sounds simple, but sometimes the settings might have been adjusted mistakenly. Ensure your thermostat is set to “cool” and that the desired temperature is below room temperature.
  • Recalibration Needs: Over time, thermostats can drift from their set points. Recalibration can often be done by following the manufacturer’s instructions. If you’re unsure, consider calling a professional or checking online tutorials specifically for your thermostat model.

why is my AC running but not cooling

The Importance of a Clean A/C Filter

The filter in your air conditioning unit plays a crucial role. It keeps dust, debris, and other contaminants from circulating in your home. However, when it becomes clogged, your A/C system’s efficiency can drop dramatically.

  • Detecting a Dirty Filter: If you notice a decrease in airflow or if your home is dustier than usual, it might be time to check your filter. A visible inspection can usually tell you if it’s dirty or clogged.
  • Cleaning or Replacement: Some filters are reusable and need a simple cleaning. Others need to be replaced. Make sure you know which type you have. If it’s the latter, ensure you replace it with the correct size and type for your system.

Dealing with a Dirty Condenser

The outdoor unit of your A/C, known as the condenser, can become dirty or obstructed. Since it plays a pivotal role in expelling heat from your home, any issues can severely impact its cooling ability.

  • Routine Checks: It’s a good practice to visually inspect your condenser unit periodically. Look for dirt, leaves, or any other debris that might be blocking the vents or fins.
  • Safe Cleaning: Turn off the power to your A/C unit. Using a garden hose, gently spray the unit to remove dirt. If there’s a thicker buildup, you might need to use a soft brush. Ensure the area around the unit is clear of tall grass or other obstructions.

fix an AC that is blowing but not cold

The Perils of a Frozen Evaporator Coil

Inside your A/C unit is an evaporator coil, which plays a crucial role in cooling the air. If this coil freezes, it can’t function properly.

  • What to Look For: If you’re getting very little airflow and the air isn’t cold, it might be a frozen coil. Sometimes, you can even see ice buildup on the unit.
  • Causes: A common cause is reduced airflow due to a dirty filter. However, it can also be because of low refrigerant levels.
  • Fix: Ensure your filter is clean. If the problem persists, consider calling a technician, especially if you suspect refrigerant issues.

Refrigerant Issues: Low or Leaking

Refrigerant is the substance that your A/C uses to cool the air. If there’s a leak or if it’s running low, your A/C will struggle.

  • Signs of Refrigerant Issues: Hissing noises can indicate a leak. Moreover, if your unit is blowing warm air even after ruling out other issues, it might be the refrigerant.
  • Handling Refrigerant: This isn’t a DIY job. If you suspect a leak or think your refrigerant is low, it’s essential to call a professional. Refrigerant needs special handling due to environmental and safety concerns.

While many of these fixes can be DIY, sometimes it’s best to trust a professional’s expertise. If you’re in doubt, or if your issues persist, consider reaching out to AlphaTek HVAC & Appliance Repair for top-notch air conditioner repair services.