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Why Is My Air Conditioner Not Blowing Cold Air?

When the sweltering heat of summer hits, there’s nothing more frustrating than turning on your air conditioner, only to feel warm air coming out. Before you start sweating bullets, Brewer Heating & Cooling explains why your air conditioner might not be blowing cold air and what you can do about it, as well as when to contact us for AC repair in Greenwood, IN.

Common Causes of an Air Conditioning System Not Cooling

Dirty Air Filters

One of the most common reasons for an air conditioner blowing warm air is a dirty air filter. Over time, dust and debris accumulate in the filter, obstructing airflow, reducing cooling efficiency, and impacting indoor air quality.

During the summer months, you may need to replace the air filter in your air conditioner or heat pump more frequently. Check your air filter regularly and replace it if it’s dirty to ensure optimal performance.

Fan Set to ON

Using the wrong fan setting on your thermostat can inadvertently cause your air conditioner to blow warm air instead of cool, refreshing air. When the fan setting is set to “on” rather than “auto,” the fan continues to run constantly, even when the air conditioner is not actively cooling.

This means that warm air from your home is continuously circulated through the system, without being cooled by the AC’s refrigeration process. Make sure that the fan setting on your thermostat is set to “auto” to allow the air conditioner to regulate the fan operation efficiently, providing you with the cool air you need to beat the heat.

Clogged Condensate Drain

As your air conditioner operates, it produces condensation, which is drained away through the condensate drain line. However, over time, dirt, debris, mold, and algae can accumulate in the drain line, forming a clog that prevents the water from draining properly. When the condensate drain becomes blocked, water can back up into the system, leading to issues such as water leaks, reduced cooling efficiency, and even system shutdowns.

To troubleshoot a clogged condensate drain, start by locating the drain line, typically found near the indoor unit of your air conditioner. Use a wet/dry vacuum or a pipe brush to remove any debris and buildup from the drain line. You can also try flushing the drain line with a mixture of vinegar and water to help break up stubborn clogs.

Ice Buildup on Evaporator Coil

Ice buildup occurs when there’s insufficient airflow across the coil or when there’s a problem with the refrigeration cycle. When airflow is restricted, such as due to a dirty air filter or blocked vents, the temperature on the evaporator coil drops too low, causing condensation to freeze and form ice. If there’s a refrigerant leak or an issue with the refrigerant levels, the coil may become excessively cold, leading to ice formation.

To troubleshoot ice buildup on your evaporator coil, start by turning off your air conditioner to allow the ice to melt completely. Check for any issues that may have caused the buildup; replace dirty air filters, clear any obstructions from vents, and ensure proper airflow throughout your home.

If you suspect a refrigerant leak or other serious issues, it’s best to contact a professional HVAC technician for further inspection and repairs.

Issues Requiring Professional Air Conditioning Repair Services in Greenwood, IN

While there are several DIY tasks you can tackle to troubleshoot your cooling system when it fails to blow cool air, some air conditioning problems require the expertise of a professional HVAC technician.

Refrigerant Leaks

Refrigerant is the lifeblood of your air conditioning system, responsible for absorbing heat from your home and cooling the air. If there’s a leak in the refrigerant lines, your AC won’t be able to cool properly.

Signs of a refrigerant leak include hissing sounds, ice buildup on the refrigerant lines, and decreased cooling performance. If you suspect a leak, you need an HVAC contractor for air conditioning service to locate and fix the issue.

Faulty Compressor

The compressor is the heart of your air conditioner, responsible for circulating refrigerant and maintaining proper pressure levels. If the compressor is faulty or malfunctioning, your AC unit may not be able to cool effectively.

Listen for unusual noises coming from the outdoor unit, such as grinding or rattling sounds, which could indicate compressor problems. In this case, it’s best to contact a licensed HVAC technician for air conditioning repair.

Honest Heating and Air Conditioning Repair

At Brewer Heating & Cooling, we pride ourselves on providing honest assessments and straightforward advice. Our team of certified technicians is equipped with the knowledge and tools to accurately diagnose and address any air conditioning issues.

We are committed to efficient and reliable air conditioning repair in Greenwood, IN, prioritizing your comfort and meeting your heating and cooling needs. With our commitment to quality service and customer care, you can trust us to deliver effective solutions that restore cool comfort in your home.

Avoid the Need for Cooling Services with Proper AC Maintenance

Preventative maintenance is key to keeping heating and cooling systems running smoothly. Schedule annual tune ups with a licensed HVAC technician to clean and inspect your air conditioning system, identify potential issues early, and ensure optimal performance.

With regular maintenance, you can reduce your chances of an air conditioning unit blowing warm air. This can save you money on heating and cooling services, as well as keep your system in service longer, preventing the need for early air conditioning replacement.

HVAC Repair Services to End Your Cooling Troubles

Malfunctioning air conditioners can ruin summer comfort, but knowing how to troubleshoot common issues can restore your cool with ease. If your air conditioning system is not cooling, give these tips a shot before you contact Brewer Heating & Cooling for air conditioning repair services in Greenwood, IN.


From keeping you cozy during winter’s chill to ensuring cool relief on scorching summer days, our expertise and commitment are second to none. Contact us today to make an appointment.

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