Reasons why Air Conditioner not Cooling

Is your air conditioner not cooling your home like it should? This common issue can be frustrating, especially during the hot summer months. There are several reasons why your AC might not be working properly, ranging from simple fixes you can do yourself to more complex problems that require a professional. Let’s explore these reasons and provide you with some DIY tips and advice on when to call a pro.

Common Reasons Your AC Isn’t Cooling

1. Dirty Air Filters

A dirty air filter can restrict airflow, causing your AC to work harder and cool less effectively. It’s one of the simplest and most common issues.

DIY Fix: Check your air filter monthly and replace it if it’s dirty. Typically, filters should be replaced every 1-3 months.

2. Thermostat Issues

Sometimes, the problem is as simple as a thermostat set incorrectly or malfunctioning.

DIY Fix: Ensure your thermostat is set to “cool” and the temperature is set lower than the current room temperature. Replace the batteries if needed, and if it's still not working, you might need a new thermostat.

3. Refrigerant Leaks

Low refrigerant levels can cause your AC to blow warm air. This issue often requires a professional because handling refrigerant can be hazardous.

When to Call a Professional: If you suspect a refrigerant leak, contact a licensed technician to locate and fix the leak and recharge your system.

4. Blocked Condenser Unit

The outdoor condenser unit can get blocked by dirt, debris, or vegetation, impeding heat exchange and cooling efficiency.

DIY Fix: Turn off the power to the unit and gently clean the fins with a garden hose. Keep the area around the condenser unit clear of debris.

5. Frozen Evaporator Coils

Frozen coils can block airflow and reduce cooling efficiency. This can happen due to poor airflow, low refrigerant, or a dirty filter.

DIY Fix: Turn off your AC and let the coils thaw. Check for dirty filters and airflow issues. If the problem persists, call a technician.

6. Leaky Ductwork

Leaky ducts can lose cooled air before it reaches your living spaces, making your AC less effective.

When to Call a Professional: A technician can inspect your ductwork for leaks and seal them to improve efficiency.

7. Electrical Issues

Problems with electrical components like capacitors, relays, or circuit boards can prevent your AC from functioning properly

When to Call a Professional: Electrical issues should be handled by a professional to ensure safety and proper repairs.

8. Faulty Compressor

The compressor is the heart of your AC system, responsible for circulating refrigerant. If it’s not working correctly, your AC won’t cool properly.

When to Call a Professional: Compressor issues are complex and require a professional to diagnose and repair.

9. Clogged Drain Line

A clogged condensate drain line can cause water to back up into the system, affecting its performance.

DIY Fix: Locate the drain line, typically a PVC pipe near the indoor unit. Use a wet/dry vacuum to clear any clogs. If the problem persists, call a technician.

10. Aging System

If your AC is over 10-15 years old, it may simply be reaching the end of its lifespan and losing efficiency.

When to Call a Professional: Consider having a professional assess whether it's time for a replacement.

Why a Manual J Calculation is Important

A Manual J calculation determines the right size for your AC system based on your home’s specific needs. This calculation considers factors such as the size of your home, insulation, windows, and more. An incorrectly sized AC can lead to poor cooling performance and higher energy bills.

The Importance of Properly Sized and Designed Ductwork

Proper airflow is crucial for your AC to work efficiently. Ductwork that is too small or improperly designed can restrict airflow, reducing your system’s cooling capacity. Ensuring your ductwork is properly sized and installed will help maintain consistent, comfortable temperatures throughout your home.

Our Service Technicians are Non-Commissioned

At SS&B Heating & Cooling, our service technicians are non-commissioned. This means they are dedicated to providing you with honest, reliable service without any pressure to upsell unnecessary products or services. You can trust that their primary goal is to ensure your comfort and satisfaction.

Final Thoughts

Understanding why your AC might not be cooling can help you address minor issues on your own and know when to call a professional. Regular maintenance, proper system sizing, and correctly installed ductwork are essential for optimal cooling performance. If you're experiencing any issues with your AC, don't hesitate to reach out to our expert technicians at SS&B Heating & Cooling for assistance.

AC issues? Give us a call! 417-580-9905, Need help? Contact online!

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