Why Is My Air Conditioner Blowing Warm Air?

July 28, 2022

Why Is My Air Conditioner Blowing Warm Air?

We all rely on the cool air conditioning of our houses to provide us the much-needed relief from the heat. During the summer, an air conditioner is one of the most soothing appliances you can own. It keeps you cool in the scorching heat and maintains a comfortable temperature inside your home.

This is the time of year when we most rely on our air conditioners. The busiest time of the year for HVAC specialists is usually the summer.

You may be wondering, why is my air conditioner blowing warm air?. Your air vents should blow cold, refreshing air. You can tell something is wrong when it seems warm or lukewarm. The good news is that even though you might need to call an expert HVAC technician, you can occasionally analyze and resolve this problem on your own.

In this blog post, we’ll talk about the most common causes of an AC blowing warm air, and how you may be able to solve the problem yourself.

Also Read: Easy Tips And Tricks To Maintain Your Air Conditioning Unit

Common Causes Of An AC Blowing Warm Air

Your AC is blowing warm air because something is turning down the cooling mechanism while the fan is running. Causes might range from basic things like thermostat settings and inadequate air intake to major ones like electrical faults and refrigerant leakage.

We’ll start with simple problems you can address yourself and let you know when you need the help of professional experts for HVAC maintenance and repair.

Thermostat Issues

If your home’s AC is blowing warm air, it might be due to thermostat issues. When old dial-type units are poorly calibrated, this commonly occurs. Check your thermostat settings if you still have the air conditioner manual. If the problem persists, you might need to replace or recalibrate your thermostat.

You can always conduct some troubleshooting to discover whether your thermostat’s settings are incorrect. This applies to both split and window air conditioners. Set the settings to “auto” rather than “on.” As a result, the fan will only turn on when the air is cooled.

Clogged Filter

Reduced airflow is one of the most common issues that can restrict your AC’s cooling operation. Despite appearances, your air conditioner needs warm air to travel over the coils to perform effectively. The filter in your air conditioner is intended to collect dust and impurities from the air passing through the unit.

However, a clogged air filter might entirely prevent air from entering the system. When this happens, the coils are unable to dissipate heat. As a result, your system’s fan just blasts heat back into your area.

Closed Or Obstructed Return Vents

Here’s another airflow issue that might cause your air conditioner to emit warm air. Is it conceivable that your vents grilles were closed and never reopened throughout the winter? Or, as is frequent in offices, do you have furniture or other obstructions in the way?

Take a trip around your area to ensure that all registers and returns are open and permit free passage of air.

Frozen AC Coil

When heat is not absorbed into the coil for a long period, it freezes due to the chemical qualities of the refrigerant. An unlikely possibility is that your air duct has tumbled due to extensive wear and tear, improper installation, or pests, and air from the return vent is unable to reach the coil.

Or, the evaporator coil is coated with dirt, preventing air from passing through. If dirt has gotten into this region, you might have a defective filter or cracks in your air ducts.

Refrigerant Leak

Refrigerant is the chemical that passes through your air conditioning system and generates cooling. Because it’s a closed loop, you shouldn’t have to add refrigerant, unless there’s a leak in the refrigerant line or the coils. When this happens, your system’s refrigerant charge and cooling power are both lost.

Depending on the amount of the leak, the cooling loss might occur gradually or suddenly, but your AC will ultimately start blowing warm air.

About Nor-Can Heating & Air

Nor-Can Heating & Air does everything we can to ensure customer satisfaction. We have a team of professional HVAC technicians with a vision and passion for achieving excellence. This makes us one of the best HVAC companies in Edmonton.

Our technicians observe strict adherence to safety standards and risk assessment procedures. Our services are not limited to installation, repair, and maintenance; we provide proper guidance and help our customers select the right HVAC devices.

We help residential and commercial clients build energy-efficient homes and offices. Contact us for any query.


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