Why Is My AC Not Blowing Cold Air? Common Causes and Fixes

When an AC is not blowing cold air on a sweltering hot day, it’s easy to start panicking. While some of the causes are easy to troubleshoot, other problems must be addressed by a professional heating, ventilation, and air conditioning (HVAC) technician. By working with Priority One Heating & Air Conditioning, you can solve your AC issue and enjoy a cooler, more comfortable home.

Why Your AC Might Stop Blowing Cold Air

Before we can dive into the answer to “Why is my AC not cooling?”, we first need to understand how an air conditioner normally works. While AC technology has improved significantly since the first compressor prototype was developed in 1851, it still relies on a compressor and the transference of heat. 

With the help of refrigerant lines, compressors, condensers, and evaporator coils, heat is absorbed inside your home and transferred outdoors. Refrigerant absorbs heat as it evaporates indoors. It is then compressed and condensed outdoors, where the heat is released.

If any part of this system stops working, your AC will stop blowing cold air. For example, faulty condenser units, low refrigerant levels, and frozen evaporator coils can keep heat from being transferred outside. Airflow issues from dirty air filters can also cause symptoms, like an air conditioner blowing warm air. Meanwhile, thermostat problems can keep your system from being triggered to turn on.

Common Reasons Your AC Isn’t Cooling Properly

If your air conditioner is blowing warm air in Eugene, there could be a few different issues at fault. 

Dirty or Clogged Air Filter

Clogged filters are one of the most common causes of poor AC performance. When filters get dirty, they restrict airflow. Fortunately, this issue can be easily fixed by replacing the air filter with a new one. Ideally, filters should be changed every 30 to 90 days.

Thermostat Issues

If the thermostat is in “fan” mode instead of “cool” mode, you won’t feel any cool air coming out of your vents. It’s also a good idea to check and replace your thermostat’s batteries as part of your troubleshooting.

After checking the settings, try testing the thermostat to see if it is working properly. Set the thermostat several degrees colder than room temperature. If the unit doesn’t kick on right away, there is something wrong with your thermostat or your AC.

Low Refrigerant or Refrigerant Leak

Refrigerants are necessary for absorbing and transferring heat. If you hear a hissing noise or notice ice buildup on your evaporator coils, there may be a leak in your refrigerant line. For legal and safety reasons, this type of AC repair must be handled by a professional HVAC technician.

Frozen Evaporator Coil

When there are airflow issues or refrigerant leaks, it can make the evaporator coil freeze. If this happens, you’ll notice that the AC is not blowing cold air. Besides poor performance, you will also see ice buildup on the evaporator coil.

Dirty or Blocked Condenser Unit

When the condenser unit is blocked by plants and debris, it limits its ability to transfer heat. As a result, your AC performance will drop significantly. For best results, you should clear a 2- to 3-foot area around your condenser unit so that no plants or debris can clog it.

Electrical or Capacitor Issues

If your AC isn’t running efficiently, it may be related to your capacitor or electrical components. These issues can also cause your AC to turn on without actually cooling your home.

Leaky or Damaged Ductwork

Leaky ducts allow cool air to escape before it can get to your room. This can result in uneven cooling in different rooms. Because your AC has to replace all of the conditioned air that is lost, it can struggle to keep up during the hottest days of the year.

Aging or Failing AC System

When a system is 10 to 15 years old, it starts to lose its efficiency. At this stage, it’s time to consider getting a replacement.

Quick Troubleshooting Steps You Can Try

Before scheduling repairs, there are a few AC troubleshooting tips you can try as an Eugene homeowner. For your safety, you should never attempt any repair that involves mechanical components, electrical systems, or refrigerants.

• Check Your Thermostat Settings: Verify that your thermostat is set to the right mode and temperature. To see if it is communicating with your unit, lower the temperature and see if the AC turns on.
• Replace Your Filter: Your AC filter needs to be changed every 30 to 90 days. If your AC isn’t blowing cold air, you should double-check the filter to see if it is clogged. During periods of peak use, it should be changed more frequently.
• Reset the Breaker: Reset the circuit breaker if it has tripped. If it immediately trips again, call for repairs. Repeated trips indicate an underlying problem that needs to be diagnosed and repaired by a professional.
• Clear Away Debris: To ensure proper airflow, remove any plant matter and debris that are within a 2- to 3-foot range of the outdoor unit.

When To Call a Professional HVAC Technician

While there are some problems that you can troubleshoot on your own, others require professional support. If you notice any of the following symptoms, it’s time to schedule AC repairs in Eugene, OR.

• Warm Air Persists: If you’ve tried troubleshooting and the warm air won’t stop, it’s time to call for help.
• Ice Buildup and Refrigerant Issues: Ice buildup is often due to leaky refrigerant, which can only be solved by finding and repairing the leak. 
• Electrical Malfunctions: For the safety of your family, HVAC system, and home, you should call our HVAC technicians if you notice any electrical problems.
• Unusual Noises: Squealing, grinding, and banging noises all have different meanings, which need to be addressed by a licensed HVAC technician.
• Frequent Cycling and Poor Airflow: Multiple problems can cause short cycling and poor airflow. For example, leaky ducts, clogged filters, and faulty blower motors can lead to airflow issues. Meanwhile, frequent cycling can be caused by low refrigerant, electrical issues, or an oversized AC. 

How To Prevent AC Cooling Problems

To avoid having AC malfunctions in the future, it’s important to be proactive about maintenance and inspections. Timely air conditioning services can help you avoid unexpected breakdowns and expensive fixes in the future.

• Regular Maintenance and Tune-ups: Routine maintenance can protect your AC from wear and tear. Tune-ups should be scheduled each spring so that your AC is prepared for the summertime cooling season. During the tune-up, our HVAC technician will lubricate moving parts, clean the condenser fins, test for performance issues, and inspect key components.
• Filter Replacements: As a homeowner, one of the most important things you can do is change your AC filter. Depending on the manufacturer’s specifications, this should be done every 30 to 90 days. During periods of peak use, the filter should be replaced more often.
• Outdoor Cleaning: Debris, weeds, and leaves can clog the outdoor unit and cause overheating. To prevent this, periodically clean a 2- to 3-foot space around the outdoor unit.

AC Repair Services in Eugene & Springfield, OR

If you’re struggling with an AC that isn’t cooling your home, we can help. Through our HVAC repair in Springfield, OR, you can access fast diagnostics and comprehensive repairs. Our local team is based in the Eugene and Springfield area. From upfront pricing to same-day services, we offer practical solutions to AC problems.

Need help with complex AC repairs? Call now and get fast service in Eugene and Springfield today.

Is It Time to Repair or Replace Your AC?

After your AC breaks down, one of our HVAC technicians will inspect the unit to determine the underlying problem. Then, we can help you decide if replacing or repairing the AC makes more sense. In general, there are a few factors to consider when thinking about this decision.

Cost Comparison: Frameworks To Guide Your Decision 

When considering the cost of the repairs, there are two general rules of thumb that are used.

• The 50% Rule: If the cost of repairing the unit is 50% of the cost to buy a new one, it makes more sense to buy a new AC. 
• The $5,000 Rule: When the age of the machine multiplied by the repair cost is more than $5,000, it’s a good idea to just get a replacement.

When Replacement Makes More Sense

While both of these rules are useful ways to frame your decision, it’s also important to consider the AC’s age and condition. If it is at least 10 years old or has a history of frequent repairs, it’s likely better to just get a replacement. 

Even if your older AC has no history of repair issues, you may want to get an upgrade for energy-efficiency reasons. Today’s HVAC systems are far more energy efficient than they were decades ago, so you can save money on your utility bills by getting an upgrade.

When Repairs Make More Sense

If the repairs involved are relatively inexpensive, fixing the unit is likely the best course of action. This is especially true if your AC has a history of delivering good performance and requiring minimal repairs. Additionally, repairs are the best course of action if you plan on moving in the near future. 

Stay Cool With Priority One Heating & Air Conditioning

Priority One Heating & Air Conditioning offers comprehensive diagnostics and expert AC repairs. When your AC stops blowing cold air unexpectedly, our team is available 24/7 to help. From a local team to reliable services, our HVAC technicians are Eugene’s trusted source of HVAC repairs and replacements.

If you’re concerned about your AC blowing warm air, we can help. Schedule your AC repairs today.

FAQs

Why is my AC running but not cooling?

Your AC can run without cooling for several reasons. For example, dirty air filters can restrict airflow in the unit. Meanwhile, blocked condenser units, refrigerant leaks, and a dirty evaporator coil can stop the unit from absorbing and releasing heat. If you can hear the fan running but not the compressor, a failed capacitor or tripped breaker may be at fault. 

Should I turn off my AC if it’s not cooling?

If your AC is not working properly in Eugene, it’s a good idea to shut it off and call for an HVAC technician. Turning it off can help you avoid additional damage. 

Often, cooling issues are due to frozen evaporator coils. Continuing to run an AC that has frozen coils will only make the coils freeze more, so it’s important to shut off your unit and let the coils unfreeze. 

How much does AC repair cost in Eugene, OR?

It all depends on the type of AC repair involved. As a general rule, repairs generally cost less when they are spotted and fixed early. By scheduling routine maintenance and responding quickly to unusual AC symptoms, you can avoid costly repairs.

Can a dirty filter stop my AC from cooling?

Absolutely. A clogged filter prevents proper airflow and can cause the evaporator coil to become dirty. Dirty coils can restrict heat transfer and airflow, which may lead to freezing under certain conditions. As the coil freezes, its ability to cool your home will rapidly decline.

How quickly can an HVAC technician fix this issue?

It depends on the cause. If your air conditioner is blowing warm air because of a dirty filter and frozen coils, the fix may be as simple as replacing an air filter. Something more complex, like a capacitor replacement, may take around 30 to 60 minutes to remedy.

However, it’s important to note that frozen evaporator coils can take up to a day to melt. Once the ice is completely gone, one of our HVAC technicians can inspect your air conditioner to diagnose and repair the root cause of your frozen coil.

Keep Your Home Cool This Summer

When your AC is not blowing cold air, you can’t afford to wait. A small problem can quickly escalate, leading to costly repairs and an uncomfortable home. 

Contact Priority One Heating & Air Conditioning today for fast, reliable services in Eugene & Springfield.