Why Isn’t My Aircon Cooling? Discover the Top Reasons and Solutions!

It’s a sweltering Arizona summer afternoon, and you’ve just spent the day out in the scorching heat. The one thing you’re looking forward to is the cool, refreshing breeze of your air conditioning (AC). But when you step inside, you’re greeted with warm air. This scenario is all too common, and it’s one that no homeowner in Phoenix wants to face. If you’re reading this, you’re probably wondering, “why is my aircon not cooling?” Well, you’ve come to the right place.

In this comprehensive guide, we’ll explore the common reasons your air conditioning may not be cooling your home effectively. We’ll provide the top solutions for each problem and when it’s time to call in the professionals at Merlin’s AC & Plumbing.

The key to solving your AC troubles lies in understanding the problem and knowing how to address it. So, let’s dive right in and help you restore your home to the cool oasis it should be during those hot Phoenix summers.

Understanding the Role of Your Aircon

Your air conditioning system is a true workhorse, tirelessly working to keep your home comfortable and cool, especially during the scorching Phoenix summers. But how does it accomplish this cooling feat?

At its core, the functioning of an air conditioner is based on the principle of heat transfer. The system comprises two main units – the indoor unit and the outdoor unit. The indoor unit houses an evaporator, which facilitates the vaporization of a cooling fluid known as refrigerant, extracting heat in the process. This is why when hot air gets expelled from your home, the cool air that you feel is released back in.

The outdoor unit contains three components: a compressor, a coil, and a fan. The compressor serves as the refrigerant’s path, boosting its pressure as it flows through the system. Then, the refrigerant is transported through the condenser coil. The fan sends atmospheric air through this coil, reducing its temperature and creating the cool air that makes your home comfortable.

In essence, your air conditioner works by removing hot air from your home and replacing it with cooler air. However, several factors could disrupt this cycling process, leading to your aircon not cooling your house effectively. Let’s delve into some of these common issues in the next section, so you can better understand what might be going wrong with your AC system.

Common Reasons Why Your Aircon Isn’t Cooling

It’s a sweltering summer day in Phoenix, AZ, and your air conditioner is giving you the cold shoulder – figuratively, not literally. What could be the problem? Here are some of the most common culprits.

Thermostat is Set Incorrectly

As simple as it sounds, one of the most common reasons your aircon isn’t cooling is because the thermostat setting is off. If your thermostat is set to heat, turned off, or set for constant fan, it may not be cooling your home effectively. Double-check the settings to ensure it’s set to cool and at the right temperature. If it’s all good but there’s still no cold air, it’s time to move on to the next possible issue.

A Jammed or Clogged Condenser Coil

Your aircon’s condenser coil plays a crucial role in removing heat from your home. When it’s clogged or blocked with dirt, grass, or other debris, it can’t do its job effectively. This could result in your AC unit running but not cooling your home. Cleaning the coil and removing any blockage can often solve this problem.

The Filters Are Clogged

Dirty or clogged air filters are another frequent offender. They block the airflow to your aircon, reducing its cooling capacity and in extreme cases, causing the system to shut down completely. A clean air filter is essential for your AC’s performance.

Insufficient Refrigerant Due to a Leak

Refrigerant is what absorbs the heat from your home and releases it outside. If your AC is low on refrigerant or there’s a leak, it can’t absorb enough heat, causing your aircon to freeze up. A professional HVAC technician should address this issue.

A Frozen Evaporator Coil

A frozen evaporator coil can also prevent your aircon from cooling your home effectively. This usually happens when the coil gets too cold due to low refrigerant levels or blocked airflow, leading to ice formation. If the evaporator coil is frozen, your aircon may blow warm air or not blow any air at all.

Insufficient Insulation and Air Leaks

Insufficient insulation and air leaks can also cause your aircon to underperform. If your home isn’t well-insulated, or if there are leaks around windows and doors, your AC will have to work harder to cool your home, resulting in less effective cooling.

By identifying these common issues, you can take the first step towards troubleshooting your aircon and restoring your home to a comfortable temperature. However, some of these problems may require professional assistance. In the next section, we’ll discuss how to troubleshoot your aircon and when it’s time to call in the experts from Merlin’s AC & Plumbing.

How to Troubleshoot Your Aircon

Now that you’re familiar with the common issues that can cause your air conditioning system to fail, let’s delve into how you can troubleshoot these problems. Remember, while some of these checks can be done by any homeowner in Phoenix, some may require professional help due to the complexity of the system or the risks involved.

Checking Your Thermostat

Kickstart your troubleshooting by examining the thermostat. The thermostat is the control center of your air conditioner and even a minor malfunction can disrupt the entire cooling process. First, ensure that it is set to “cool” and the temperature is set lower than the room temperature. If it’s not functioning properly, you might need to call in a professional for repair.

Inspecting the Condenser Coil

Next, move on to the condenser coil in your outdoor unit. This coil plays a vital role in heat transfer and a blockage can reduce your system’s cooling ability. If your air conditioner is running, but not lowering temperatures inside, one issue could be a blocked or clogged condenser coil. You can attempt to clean the coil by clearing away debris, carefully vacuuming the coil with a brush attachment, or rinsing gently with a hose.

Cleaning or Replacing Clogged Filters

Air filters in your air conditioner are responsible for keeping your indoor air clean. Over time, these filters can become clogged with dust, dirt, and debris, reducing the efficiency of your air conditioning unit. To prevent this, clean or replace your air filters regularly. For washable filters, rinse them off with water and let them air dry. For disposable filters, replace them every three months or as recommended by the manufacturer.

Identifying and Fixing Refrigerant Leaks

Refrigerant is a key component of your air conditioner, helping in cooling your home. Signs of a refrigerant leak include warm air coming from the vents, frozen coils, and strange hissing or bubbling sounds. If you suspect a refrigerant leak, a qualified technician will need to inspect the system.

Dealing with a Frozen Evaporator Coil

A frozen evaporator coil can prevent your aircon from cooling effectively. If your aircon is running but not cooling, check your evaporator coil. If it’s frozen, turn off your system to let it defrost. If the coil continues to freeze, it may indicate a more serious problem such as a refrigerant leak.

Addressing Insulation and Air Leaks

Lastly, poor insulation and air leaks in your home can also impact the effectiveness of your aircon. Check for drafts around windows and doors, and consider adding insulation in your attic or walls to help your air conditioner cool your home more efficiently.

Performing these checks can help you identify and possibly even rectify some of the common issues affecting your air conditioning. However, remember that some issues can be complex and require the expertise of a professional HVAC technician. If you’re still experiencing cooling issues after troubleshooting, it’s time to call the experts at Merlin’s AC & Plumbing.

When to Call a Professional: Merlin’s AC & Plumbing Services

When your aircon simply refuses to produce the cool air you crave, it’s time to turn to the experts. Merlin’s AC & Plumbing offers a range of specialized services that are specifically designed to get your aircon back on track and keep your home comfortable, even in the heat of a Phoenix summer.

Same-Day Service

We understand that a malfunctioning aircon can quickly turn your home into a sauna. That’s why we offer same-day service for those unexpected emergencies that just can’t wait. Our skilled technicians are available around the clock to ensure that your aircon is up and running as quickly as possible. No need to suffer through a hot night – we’re here to help!

Upfront Pricing

At Merlin’s AC & Plumbing, we believe in transparency and fairness when it comes to pricing. That’s why we provide a clear, upfront cost estimate before any work begins. This way, you’re not hit with any surprise charges or hidden fees once the job is done. We understand that aircon repairs can be costly, and we strive to make our services as accessible and affordable as possible.

100% Satisfaction Guarantee

Your comfort and satisfaction are our top priorities. That’s why we offer a 100% satisfaction guarantee on all our services. If you’re not completely satisfied with the work we’ve done, we’ll do everything we can to make it right. This is just one of the ways we strive to provide the best HVAC services in Phoenix, AZ.

So when your aircon isn’t cooling, don’t sweat it – call Merlin’s AC & Plumbing instead. Our team of experienced technicians will quickly diagnose the issue and provide an effective solution so you can get back to enjoying a cool, comfortable home.

Preventive Measures to Keep Your Aircon Cooling Effectively

Don’t wait until Phoenix’s scorching summer heat strikes to find out your aircon isn’t cooling. Proactive maintenance and regular check-ups can help keep your air conditioning system in top shape, ensuring it cools your home effectively when you need it most. Here are some preventive measures you can take to ensure your aircon is always ready to beat the heat.

Regular Cleaning and Maintenance

The importance of regular cleaning and maintenance of your air conditioning system can’t be overstated. As the old adage goes, “prevention is better than cure.” This rings especially true for air conditioning maintenance. Regularly cleaning components like the air filters can significantly improve the efficiency of your air conditioner and improve the quality of air circulating in your room. Remember, clogged filters can hamper airflow and lead to a myriad of issues, including your aircon not cooling your home effectively.

Moreover, ensure the condenser unit outdoors is unblocked and free from debris like dirt, dead grass, or leaves. A clean condenser coil is crucial for effective heat transfer and cooling. Routine maintenance checks by professional HVAC technicians can also help identify potential issues before they become major problems.

Proper Installation and Sizing

The size of your air conditioning unit matters. An oversized unit can lead to short cycling, which increases wear and tear and decreases efficiency. Conversely, an undersized unit may struggle to cool your home effectively, especially during hot days. Therefore, it’s essential to consult with a professional HVAC technician to determine the right size unit for your home. They’ll consider factors like the size of your home, the number of occupants, and other factors to recommend the right size unit for your needs.

Regular Check on Refrigerant Levels

The refrigerant is the lifeblood of your air conditioning system. It’s what cools the air that circulates through your home. Regular checks on refrigerant levels are vital to ensure your AC unit is functioning effectively. Low refrigerant levels due to leaks or other issues can cause your air conditioner to run but not cool your house. If you suspect your AC unit is low on refrigerant, it’s essential to consult with a professional HVAC technician to diagnose the issue and recharge the system.

Remember, regular maintenance can help prevent these issues and ensure your aircon is always ready to keep your home cool and comfortable. Take action today to ensure a cool, comfortable summer tomorrow.


As the summer sun blazes over Phoenix, AZ, you’ll want your aircon to be your best ally, efficiently cooling your home and providing a haven from the heat. However, even the most reliable systems can falter, refusing to cool as they should and leaving you sweltering. But now, armed with the knowledge from this guide, you’re well-equipped to troubleshoot and understand the common reasons why your air conditioner might not be cooling.

Remember, issues like an incorrectly set thermostat, a clogged condenser coil, dirty filters, insufficient refrigerant due to a leak, a frozen evaporator coil, and poor insulation can all hinder your aircon’s performance. But don’t despair; many of these problems can be resolved with some basic troubleshooting. Yet, in some cases, professional expertise is needed.

That’s where Merlin’s AC & Plumbing comes in. Our skilled technicians offer prompt, same-day service, transparent pricing, and a 100% satisfaction guarantee. We’re dedicated to ensuring your home is a cool, comfortable oasis, no matter how high the mercury rises outside.

Prevention, as the saying goes, is better than cure. Regular cleaning, maintenance, and checks on refrigerant levels can help keep your aircon in top-notch condition, preventing issues before they arise. Also, ensuring your aircon is properly installed and of the right size for your space is crucial for optimal functionality.

In conclusion, your aircon not cooling can be a significant inconvenience, especially in the heat of the summer. But knowing what to look out for and when to call in the professionals can make all the difference. Remember, at Merlin’s AC & Plumbing, we’re always ready to help you beat the heat. So don’t sweat it; we’ve got you covered!

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