Appointment Lookup
213-596-2538
Learn how an air filter works in your HVAC system and how to choose the right filter.
Why Doesn't My AC Cool the House Well?
When your AC unit is not cooling properly, it can be both uncomfortable and frustrating, especially during the hot summer months. Understanding the potential reasons behind your AC's poor performance can help you troubleshoot and fix the issue. In this article, we'll explore some common causes of an AC not cooling well, including airflow issues, thermostat problems, and ductwork concerns. Identifying and addressing these issues can help ensure your AC operates at peak efficiency.
KEY TAKEAWAYS
- If your AC is not cooling well, a dirty air filter, clocked condenser coils or a clogged condensate drain line could be causing the problem.
- Additional problems that could be apparent when your find your AC unit not cooling properly include blocked vents, a faulty fan motor, thermostat problems or ductwork issues.
- When your air conditioner is not cooling well and you’re unable to determine the cause of the problem yourself, schedule AC repair service to have a Sears Home Services technician visit your home and fix the unit.
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.
Frequently Asked Questions
What causes weak AC cooling?
Low refrigerant, dirty coils, improper sizing, or leaky ducts. Sears Home Services diagnoses each possibility for the correct fix.
Could thermostat placement be the issue?
Yes, if it’s near a sunny window or a draft, it may read temperatures inaccurately. Sears Home Services can suggest a better location or install a remote sensor.
Do older units simply lose efficiency over time?
Yes, parts degrade and can’t cool as effectively. Sears Home Services discusses whether repair or upgrade is more cost-effective.
Can adding insulation help?
Yes, improving attic or wall insulation reduces heat gain, making your AC’s job easier. Sears Home Services can direct you to home improvement solutions for better comfort.
Schedule your HVAC repair now!
Rely on our skilled technicians to diagnose and repair your HVAC equipment, ensuring optimal comfort in your home.
Chat
Loading scheduler options...
Repair HVAC Resources
Improve indoor air quality and protect your family's health with HVAC maintenance, air purifiers, and natural solutions like plants and proper ventilation.
Wondering what it costs to replace an air conditioner in 2026? This guide explains average replacement pricing, SEER2 efficiency costs, and how to decide whether to repair or replace your AC system.
Discover the benefits of a humidifier and learn how to choose the right one for better indoor air quality and comfort.
Glossary Terms
The 608 Certification, mandated by the Environmental Protection Agency (EPA), is required for HVAC technicians to legally handle refrigerants. It ensures technicians understand refrigerant types, environmental impact, and proper handling techniques.
A compressor is a mechanical device that increases the pressure of a gas by reducing its volume, essential in various systems including refrigerators, air conditioners, and HVAC units for cooling and refrigeration processes.
A condenser is a component of HVAC and refrigeration systems, responsible for releasing absorbed heat from the refrigerant into the outside air or a water line, thus facilitating the cooling process.
A capacitor in an AC unit is an electrical component that stores and releases electrical energy to help start the motor and stabilize the voltage during operation.
Common Repair HVAC Symptoms
When your Payne central air conditioner won’t turn on or isn’t cooling, check for power problems, a failed capacitor, or a clogged condensate drain. This guide covers quick, safe troubleshooting steps and explains when to call Sears Home Services for expert central AC repair.
When your ICP central air conditioner won’t turn on or isn’t cooling, check for power problems, a failed capacitor, or a clogged condensate drain. This guide covers quick, safe troubleshooting steps and explains when to call Sears Home Services for expert central AC repair.
When your Heil central air conditioner won’t turn on or isn’t cooling, check for power problems, a failed capacitor, or a clogged condensate drain. This guide covers quick, safe troubleshooting steps and explains when to call Sears Home Services for expert central AC repair.
When your Carrier central air conditioner won’t turn on or isn’t cooling, check for power problems, a failed capacitor, or a clogged condensate drain. This guide covers quick, safe troubleshooting steps and explains when to call Sears Home Services for expert central AC repair.
When your Comfortmaker central air conditioner won’t turn on or isn’t cooling, check for power problems, a failed capacitor, or a clogged condensate drain. This guide covers quick, safe troubleshooting steps and explains when to call Sears Home Services for expert central AC repair.
When your Ruud central air conditioner won’t turn on or isn’t cooling, check for power problems, a failed capacitor, or a clogged condensate drain. This guide covers quick, safe troubleshooting steps and explains when to call Sears Home Services for expert central AC repair.