AC Not Cooling? Learn 5 Reasons and How to Fix It

Is there anything more annoying than AC that does not cool? We do not think so. Now throw in summer hot on top, and you get the level of annoyance we all experience. So, if your air conditioner is running but not blowing cold air, there must be an issue. 

From clogged filters to leaks, this guide covered the five most common reasons why your AC is not cooling. As a bonus, you will also get a few tips on how to fix those. So, let’s dive into it. 

Importance of Proper AC Maintenance

Before moving further within this guide, first, let’s understand the importance of proper AC maintenance for the long run. The main reasons include the following: 

• Regular maintenance helps improve the efficiency of your AC, ensuring it uses less energy and lowers utility bills.

• Proper maintenance extends the lifespan of your system by preventing wear and tear from neglect.

• It reduces the likelihood of costly repairs by identifying and addressing issues early before they become major problems. 

Top 5 Reasons Why Your AC Is Not Cooling 

As soon as we are clear on the importance of proper AC maintenance, let’s dive deeper into the reasons why your AC is not working and understand how to fix it. 

Dirty Cooling Coils

Over time, your AC’s evaporator and condenser coils collect dirt and debris, reducing their ability to absorb and release heat effectively. This buildup forces the system to work harder, leading to inefficient cooling or even system failure.

• Clean the coils using a soft brush or vacuum to remove dust and debris.

• Use a coil cleaner spray for deeper cleaning and rinse with water if recommended.

• Schedule professional maintenance to prevent excessive buildup and ensure optimal performance.

Dirty Air Filter

A clogged air filter restricts airflow, making it difficult for your AC to circulate cool air efficiently. This can lead to weak airflow, higher energy consumption, and even frozen coils.

• Check and replace the air filter every 1-3 months, depending on usage and air quality.

• Use a high-quality filter suited for your AC model to improve efficiency.

• Keep vents and ducts clean to prevent additional airflow restrictions.

Refrigerant Leak

Refrigerant is essential for cooling, and a leak can cause your AC to blow warm air or stop working entirely. Low refrigerant levels also put extra strain on the compressor, leading to costly repairs.

• Look for signs of a leak, such as ice buildup on the coils or hissing sounds from the unit.

• Contact a professional to locate and seal the leak before recharging the system.

• Avoid DIY refilling, as handling refrigerants requires specialized knowledge and equipment.

Blocked Condenser Unit

The outdoor condenser unit plays a crucial role in releasing heat, but dirt, leaves, and debris can obstruct airflow, preventing proper heat exchange and reducing cooling efficiency.

• Clear any debris, leaves, or obstructions around the outdoor unit to allow proper airflow.

• Gently clean the condenser fins using a soft brush or hose to remove dirt buildup.

• Ensure at least two feet of clearance around the unit for unobstructed ventilation.

Improper Thermostat Settings

Incorrect thermostat settings can make it seem like your AC isn’t working when it’s actually set improperly. A malfunctioning thermostat can also prevent the system from cooling efficiently.

• Set the thermostat to cooling mode and ensure the temperature is lower than the current room temperature.

• Replace the thermostat batteries if they’re unresponsive or not displaying correctly.

• Consider upgrading to a programmable or smart thermostat for better control and efficiency.

Bonus Reasons 

Faulty AC Capacitor

The capacitor is responsible for starting and running the compressor and fan motors. If it fails, your AC might struggle to turn on or cool properly, leading to inconsistent performance. 

• Listen for clicking or humming noises when the AC tries to start, which can indicate a failing capacitor.

• Avoid DIY capacitor replacement, as it stores electrical charge and can be dangerous to handle.

• Call an HVAC technician to test and replace the capacitor if necessary.

Old System

If your AC is over 10-15 years old, its efficiency naturally declines due to wear and tear. Older systems may struggle to cool effectively, even with proper maintenance, and can lead to higher energy bills and frequent breakdowns.

• Check if your AC is nearing the end of its lifespan and compare its efficiency to newer models.

• Upgrade to an energy-efficient unit with a high SEER rating to reduce energy costs.

• Schedule a professional inspection to determine whether repairs or a full replacement is the best option. 

Get Quality AC at Voomi 

If you are looking for a reliable AC for your apartment or office, then you are in the right place. At Voomi, you can find a wide collection of quality AC systems that will last you a long time. So, make sure to browse online or visit us, and our professionals will help you find the perfect AC for your home.