Why Doesn't My AC Cool the House Well?: 2025

Common Causes of AC Not Cooling Properly

If your AC is not cooling your home effectively, there are several common issues you can check before calling a professional technician. Addressing these problems early can save on repair costs and restore your AC's performance. Here are three typical reasons why your AC might not be cooling well:

• Clogged air filters: Dirty air filters are a frequent cause of poor cooling. Over time, filters gather dust and debris, which restricts airflow and reduces cooling efficiency. Make it a habit to check and replace your air filters at least monthly – or every three months for some models.
• Dirty or blocked condenser coils: When condenser coils are covered in dirt or blocked by vegetation, they can't absorb or release heat efficiently. Regular maintenance, including cleaning the condenser coils, can prevent this problem and improve your AC's performance.
• Blocked condensate drain line: Many AC units have a float switch that detects when the condensate drain line is blocked and water is backing up in the drain pan below the evaporator. The AC shuts down cooling when this condition occurs even though the inside blower fan often continues running. If you find water dripping below the inside unit in your home when cooling stops, take the troubleshooting steps shown in this video to clear the drain line and restore cooling in your home:

If you've checked these common causes and your AC still isn't cooling well, it's time to schedule AC repair service to have a professional HVAC technician from Sears Home Services visit your home and fix the problem. Our techs have the expertise and tools to diagnose and resolve more complex issues causing your AC unit not cooling properly problem.

Other Causes of an AC Unit not Cooling Properly

Blocked Vents or Registers

Improper airflow is another common reason for an AC not cooling well. Efficient airflow is crucial for your air conditioning system to function correctly. Poor AC cooling can often be traced back to blocked vents or registers. Ensure all vents and registers are open and unobstructed by furniture, curtains, or other objects. Blocked vents restrict airflow and hamper your AC's ability to cool your home. Also, make sure return air vents aren’t blocked or restricted so air circulates properly through your home.

Inadequate Insulation

Insufficient insulation can lead to air leaks that affect your AC's cooling efficiency. Inspect for gaps or cracks around doors, windows, and walls, and seal them properly. Good insulation helps maintain a comfortable indoor temperature and allows your AC to operate optimally.

Faulty Fan Motor

A malfunctioning fan motor can also impact airflow. If the fan motor isn't working correctly, it may not circulate air effectively, resulting in inadequate cooling. If you suspect a faulty fan motor, it's best to have a professional HVAC technician inspect and repair it.

Addressing these airflow issues can significantly improve your AC's cooling performance, ensuring a comfortable indoor environment.

Thermostat Problems

The thermostat plays a key role in regulating your home's temperature. Several thermostat issues could be causing your AC to not cool well.

Incorrect Temperature Settings

Begin by checking the temperature settings on your thermostat. Ensure it's set to a temperature lower than the current room temperature. Sometimes, incorrect settings can lead to inadequate cooling.

Malfunctioning Thermostat

A malfunctioning thermostat can disrupt the cooling process. If it's unresponsive or displaying incorrect temperature readings, it may be time for a replacement. Consult a professional HVAC technician to diagnose and fix the issue.

Thermostat Placement Issues

The location of your thermostat can affect its performance. If it's placed near heat sources like direct sunlight, appliances, or vents, it may provide inaccurate readings and impact cooling efficiency. Consider relocating the thermostat to a more suitable area.

If your AC is still not cooling well after checking these thermostat issues, contact a trusted HVAC professional like Sears Home Services for air conditioner repair. Our experienced technicians can diagnose the problem and provide expert solutions.

Ductwork Concerns

Ductwork issues can also cause your AC to not cool well. Here are some common ductwork problems that might be affecting your system's performance.

Leaky or Disconnected Ducts

Over time, ducts can develop cracks or gaps, allowing cooled air to escape before reaching its intended destination. This reduces cooling efficiency and causes uneven temperature distribution. Our experts at Sears Home Services specialize in identifying and repairing leaky or disconnected ducts to ensure optimal airflow throughout your home.

Restricted Airflow

Obstructions such as dirt, debris, or furniture blocking vents can impede airflow, making it harder for your AC to cool your home effectively. Regularly cleaning and maintaining your vents can help prevent airflow restrictions and improve your AC's overall efficiency.

Inadequate Duct Insulation

Poor insulation in your ducts can lead to energy loss, as cool air may warm up before reaching its destination. Our team can assess your duct insulation and recommend solutions to help maintain the desired temperature throughout your home.

At Sears Home Services, we understand the importance of a properly functioning AC system, particularly during hot summer months. Our expert technicians are equipped to diagnose and resolve any ductwork concerns that may be hindering your AC's cooling performance. Contact us today to schedule an AC repair appointment and ensure your home stays cool and comfortable.

When you have an older HVAC system in your home, consider replacing the AC with a new, energy-efficient unit. Schedule a consultation with a local HVAC expert to begin the replacement process and keep your home comfortable all summer long.