Why is My AC Blowing Warm Air? Discover the 8 Possible Reasons

AC Blowing Warm Air

It’s the middle of summer, and your air conditioner is blowing warm air. You know that you need to get it fixed, but you’re not sure what’s wrong. You could be dealing with any one of a number of possible issues. In this blog post, we will discuss some of the most common reasons why an AC might blow warm air. We will also provide tips on how to troubleshoot and fix the issue yourself.


Low Refrigerant

This might be the top culprit behind your AC blowing warm air. If there is a leak, your AC system will struggle to produce cool air. You will know that there is refrigerant leakage when the outdoor and indoor AC systems have ice building up on them. What’s more, you may also hear a bubbling or hissing sound.

Finding leaks and fixing holes are time-consuming and expensive. If not fixed immediately, the damage can extend to the compressor motor. For this problem, the quick solution is a refrigerant change. A maintenance tune-up at least twice a year is also required.

If you need any professional assistance, then contact the nearest appliance repair company in your area. 

Unclean Air Filters 

The air filters in your AC unit are designed to trap all kinds of particles and pathogens in the air. While they help keep home air fresh, clean, and safe to breathe, these filters also become saturated in due course. If they have become blocked, this will limit the flow of air and keep cool air from circulating properly in your home. Also, it can cause the system to work double time, leading to other issues. 

The best solution is to change your AC filters every 90 days. The type of filters to use will depend on many factors. If you have zero knowledge about this, then there’s no other way to address the issue than to hire a licensed technician that specializes in air conditioner service Waco, TX. 

Frozen Evaporator Coils

This is another reason for AC blowing warm air. These components are filled with coils that serve like a sponge and absorb heat from the air. Improper air flow can lead to the evaporator becoming extremely cold, leading to the formation of ice. If this occurs, your AC will produce warm air or no air. Warm air must flow around the coils for them to work correctly. 

Dirty AC air filters result in frozen and dirty evaporator coils. But, while filters are easy to replace, you still need an expert to clean the coils. Never try to remove the coils because they are prone to damage if you don’t know how to handle them properly. 

Fan Problems

The fan not working correctly can be due to issues such as worn belts, faulty motor, or lack of lubrication. Debris and dirt can also be culprits behind fan problems. If the fan fails to work the way it should, this can lead to poor airflow in your AC, leading to your unit blowing warm air. If taken for granted, fan issues may lead to the failure of the compressor motor. 

To solve this, you need to examine if the fan motor needs cleaning or must be replaced. If it’s still operating but not fully functioning, call an expert that offers appliance repair Waco, TX to check the issue. They will also check if the blades are dirty and clean them off using a soft cloth and a vacuum. 

Clogged Drains

A clogged drain can also cause the AC to blow warm air. Your AC unit removes moisture from the air and expels it into a drain line. However, once the drain line is clogged because of dirt or debris, the water will go back and damage the unit. Worst, the water leaks and goes into the ceilings, walls, and furnishing. This can result in mold growth if not addressed immediately. 

Some clogs are easy to fix. If the clog is visible, you can eliminate it on your own. You can also use a cleaning solution to avoid the buildup of dirt in the drain lines. 

Soiled Condenser Coils

The condenser coils in your AC unit eliminate heat from the air and force it outside your home. Being part of the outdoor AC, condenser oils are often exposed to different elements. In due course, they get exposed to grime and dirt buildup. This obstructs the transfer of heat, and you will notice this when your air conditioner starts blowing warm air. The grimy and soiled condenser coils put undue pressure on the whole unit, resulting in wear and tear on components. 

The best way to address this issue is to clean your outdoor AC unit regularly to keep the condenser in good working condition. Remove debris and weed surrounding the AC and hose it down to eliminate caked-up grime. However, make sure to switch off the unit before cleaning. 

AC Blowing Warm Air

Thermostat Issues 

The thermostat is the first thing you must check if you notice your AC blowing warm air. This often takes place in outdated units once they are calibrated mistakenly. If you have the AC manual, see if the thermostat is set properly. If the issue persists, you may need to recalibrate or replace the thermostat. 

You can do some DIY troubleshooting to know if the settings in the thermostat are not correct. This works for window AC and split-type units. Turn to auto mode instead of on mode. This set allows the fan to just work when the air is being cooled. 

Updating to a programmable thermostat can help address the issue. Outdated control units are likely to malfunction easily. But, with a programmable thermostat, you can consistently keep the temperature inside your house. 

It’s Time to Get a New One

Regardless of the model and make, your AC unit will eventually malfunction. An AC has an average lifespan of 15 to 20 years, and it depends on how you use and take care of it. Routine maintenance, like cleaning and replacing air filters and having tune-ups once a year, can greatly help in keeping the unit in good condition. If you are following the suggested maintenance and your AC is still malfunctioning, perhaps it is the right time to buy a new one. Talking to a reliable appliance repair company can help you select the best AC unit ideal for your needs. 


Don’t let AC blowing hot air ruin your day. Book an appointment with On Point Service Company right away. Located in Waco, TX, we have been in business for several years. Our team of experienced and licensed technicians ensure that all air conditioner repair and replacement services are done on time and effectively. You can also count on us when it comes to other services such as AC not cooling, AC not blowing cold air, and more. Call now to take advantage of our affordable air conditioning service. 


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