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Why is the AC Blowing Warm Air & How to Fix It

air conditioning unit not working

Short on time? No worries, we’ve got you covered with a TL;DR.

Is your AC blowing warm air? Common culprits include incorrect thermostat settings, dirty filters, frozen coils, and refrigerant issues. Some fixes are DIY-friendly, while others might need a professional touch. Regular maintenance is key. Stay cool and troubleshoot wisely!

Hello there, dear friends of Veteran Heating and Cooling! Today, we’re diving deep into a common summer conundrum: your AC is running, but the air isn’t cold. Before you break into a sweat, we’ve got you covered with a comprehensive guide on why this happens and how to fix it. From thermostat checks to ductwork dilemmas, we’ll help you restore that refreshing cool breeze in no time. Let’s get started!


Air conditioning is a blessing

Especially during the sweltering summer months. But what happens when your AC turns on, the fan is blowing, but the air isn’t cool? It’s a common issue that many homeowners face. Let’s dive into some potential reasons and solutions.


Thermostat Setting

Tip: Always start with the basics. Ensure your thermostat is set to “cool” and not “fan only.” Additionally, check if the temperature setting is lower than the current room temperature.

How to Fix: If the thermostat is set incorrectly, adjust the settings. Ensure it’s set to “cool” and reduce the temperature setting.


Dirty Air Filter

Tip: A clogged air filter can restrict airflow, causing the AC system to struggle to cool the air.

How to Fix: Check the air filter. If it’s dirty, replace it with a new one. It’s a good practice to change the air filter every 1-3 months, depending on usage and the type of filter.


Frozen Evaporator Coils

Tip: The evaporator coils absorb heat from the air. If they get too cold, a layer of ice can build up, preventing them from cooling the air effectively.

How to Fix: Turn off your AC and let the coils thaw. Check the airflow; restricted airflow can cause the coils to freeze. Ensure the air filter is clean and all vents are open and unblocked.


Refrigerant Issues

Tip: Low refrigerant levels or a refrigerant leak can hinder the AC’s cooling capacity. 

How to Fix: If you suspect a refrigerant issue, it’s best to call a professional. Handling refrigerant requires expertise, and it’s illegal to release it into the atmosphere.


Dirty Condenser Coils

Tip: Located in the outdoor unit, the condenser coils expel the heat removed from the air. If they get dirty, they can’t function efficiently.

How to Fix: Clean the condenser coils. Turn off the power, and using a garden hose, gently wash away the dirt. For stubborn grime, use a coil cleaner.

Outdoor Unit Issues

Tip: The outdoor unit contains critical components. If it’s not working correctly, your AC might not cool the air.

How to Fix: Ensure the outdoor unit is powered on. Check for any visible damages or obstructions and remove them. If the fan isn’t working, it might need a replacement.

Ductwork Problems

Tip: Leaks or blockages in the ductwork can reduce the airflow and the system’s cooling capacity.

How to Fix: Inspect the ducts for any visible signs of damage or blockage. Seal any leaks with duct tape. For significant issues, consider hiring a professional.