Why Is My AC Running But Not Cooling In Suwanee?

It’s a hot summer day in Suwanee, and you’ve noticed that your air conditioner is running, but it’s not cooling your home. This can be frustrating, especially when you’re relying on your AC to keep you comfortable. Several factors could be causing this issue, and understanding them can help you diagnose and resolve the problem. Let’s explore some common reasons why your AC might be running but not cooling properly.

Dirty Air Filter

One of the most common reasons for an AC running but not cooling effectively is a dirty air filter. Over time, the air filter in your HVAC system can become clogged with dust, dirt, and other debris. 

Impact on Airflow:

A dirty air filter restricts the airflow into your HVAC system. This means that less air is able to pass through the filter and into your home, reducing the efficiency of your AC. Restricted airflow can also lead to increased wear and tear on your HVAC system, as it has to work harder to cool your home.

Reduced Cooling Efficiency:

When airflow is restricted, your AC has to work harder to cool your home. This can lead to increased energy consumption and higher utility bills. Additionally, a dirty air filter can cause your AC to freeze up, as the reduced airflow can cause the evaporator coils to become too cold and freeze.


The solution to a dirty air filter is simple: replace it regularly. Check your air filter every month and replace it if it looks dirty or clogged. For most homes, replacing the air filter every 1-3 months is sufficient. You can also consider upgrading to a high-efficiency air filter, which can capture smaller particles and improve indoor air quality.

Refrigerant Leak

When your AC is running but not cooling, a refrigerant leak could be the culprit. Refrigerant is the chemical that absorbs heat from inside your home and releases it outside. If there’s a leak in the refrigerant line, your AC won’t be able to cool effectively. Here’s why a refrigerant leak can cause issues and how it can be fixed:

Impact on Cooling:

Refrigerant is crucial for the cooling process in your AC. When there’s a leak, the refrigerant level drops, affecting the system’s ability to absorb and release heat. This can result in your AC running constantly but not cooling your home effectively.

Increased Energy Consumption:

A refrigerant leak forces your AC to work harder to maintain the desired temperature, leading to increased energy consumption. This not only results in higher energy bills but also puts unnecessary strain on your AC, potentially shortening its lifespan.

Environmental Impact:

Refrigerant leaks are not only harmful to your AC’s performance but also to the environment. Refrigerants contain chemicals that can deplete the ozone layer if released into the atmosphere. It’s important to address leaks promptly to minimize environmental impact.


Fixing a refrigerant leak requires the expertise of a professional HVAC technician. Here’s how they typically address the issue:

Locate the Leak: The technician will use specialized tools to locate the leak in the refrigerant line. This may involve inspecting the coils, connections, and other components of your AC system.

Repair the Leak: Once the leak is located, the technician will repair it using appropriate materials and techniques. This may involve welding, soldering, or applying a sealant to the leak.

Recharge the Refrigerant: After the leak is repaired, the technician will recharge the refrigerant to the correct level. This ensures that your AC has enough refrigerant to cool your home efficiently.

Faulty Thermostat

A faulty thermostat can cause your AC to run but not cool your home properly. The thermostat is responsible for regulating the temperature in your home and telling your AC when to turn on and off. Here’s why a faulty thermostat can be a problem and how to address it:

Incorrect Settings:

Sometimes, the issue with your AC not cooling could be as simple as incorrect thermostat settings. Ensure that the thermostat is set to “cool” mode and that the temperature setting is lower than the current room temperature. Also, check that the fan setting is set to “auto” rather than “on.”

Calibration Issues:

Over time, thermostats can become uncalibrated, leading to inaccurate temperature readings. This can cause your AC to run when it’s not needed or vice versa. Recalibrating the thermostat or replacing it if it’s old can help resolve this issue.

Wiring Problems:

Faulty wiring or loose connections in the thermostat can also cause issues. If you’re comfortable doing so, check the wiring behind the thermostat to ensure everything is connected properly. If you notice any loose wires or damaged insulation, consider calling a professional to repair it.


Battery Replacement: If your thermostat is battery-powered, the batteries may be dead. Replace the batteries with new ones and see if this resolves the issue. It’s a simple fix that can often solve the problem.

Consider Replacement: If none of the above solutions work, it may be time to consider replacing the thermostat. Older thermostats can become less reliable over time and may not communicate effectively with your AC system. A new, programmable thermostat can offer improved functionality and energy efficiency.

Professional Inspection: If you’re unsure about how to address thermostat issues or if you suspect a more complex problem, it’s best to consult with a professional HVAC technician. They can inspect your thermostat, diagnose any issues, and recommend the best course of action.

Blocked Air Vents

Blocked air vents can prevent proper airflow, leading to reduced cooling efficiency. Air vents can become blocked by furniture, curtains, or other items, preventing air from circulating effectively. Here’s why this can be a problem and how to address it:

Impact on Airflow:

Blocked air vents restrict the flow of cool air into your home, making it harder to maintain a comfortable temperature. This can lead to your AC running longer than necessary, increasing energy consumption and wear and tear on your system.

Uneven Cooling:

Blocked air vents can also cause uneven cooling in your home, with some rooms feeling warmer than others. This can be uncomfortable and inefficient, as your AC tries to compensate for the blocked vents.


To address blocked air vents, ensure that all vents in your home are open and unobstructed. Move furniture and other items away from vents to allow for proper airflow. Consider using vent deflectors to direct air where it’s needed most.

Dirty Condenser Coils

Condenser coils are responsible for releasing heat from your AC system. Over time, these coils can become dirty, reducing their ability to transfer heat effectively. Here’s why dirty condenser coils can be a problem and how to address them:

Impact on Cooling Efficiency:

Dirty condenser coils can reduce the efficiency of your AC system, as the coils struggle to release heat. This can lead to your AC running longer to cool your home, increasing energy consumption and potentially causing damage to your system.


To improve cooling efficiency, schedule a professional cleaning of your condenser coils. A professional HVAC technician can safely clean the coils, removing dirt, debris, and other buildup that can impede heat transfer. Regular cleaning of condenser coils can help maintain the efficiency of your AC system and prolong its lifespan.

Insufficient Insulation

Insufficient insulation in your home can allow cool air to escape, reducing the effectiveness of your AC system. Here’s why this can be a problem and how to address it:

Impact on Cooling:

Insufficient insulation can allow cool air to escape through walls, ceilings, and floors. This can result in your AC running longer to maintain a comfortable temperature, increasing energy consumption and costs.


Improve insulation in your home to prevent cool air from escaping. This can include adding insulation to walls, ceilings, and floors, as well as sealing gaps and cracks where air can leak out. Proper insulation can help your AC system operate more efficiently and reduce energy costs.

Malfunctioning Compressor

The compressor is the heart of your AC system, responsible for circulating refrigerant and facilitating the cooling process. If the compressor is malfunctioning, your AC may run but not cool properly. Here’s why this can be a problem and how to address it:

Impact on Cooling:

A malfunctioning compressor can prevent your AC from effectively cooling your home. This can result in reduced cooling efficiency, higher energy bills, and potential damage to other components of your AC system.


If you suspect a malfunctioning compressor, contact an HVAC technician to inspect and repair the compressor if necessary. The technician will diagnose the issue and recommend the best course of action, which may include repairing or replacing the compressor. It’s important to address compressor issues promptly to avoid further damage to your AC system.

When your cooling system is running but not blowing cold air, it can be a frustrating experience, especially during the hot summer months in Suwanee. By understanding the potential causes of this issue, you can take the necessary steps to resolve it and restore comfort to your home.

Experiencing issues with your AC unit in Suwanee? Contact Zen Air Heating & Cooling for expert AC repair service that you can trust! Join Club Zen to save money and get regular maintenance for your air conditioning system. We also offer financing for your convenience. Stay cool and comfortable all summer long 🌬️🏠.

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