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Why Isn’t My Air Conditioner Blowing Cold Air?

Jul 15, 2020

Air Conditioning
woman laying on couch with arms crossed & hat covering her face from not maintaining her Lennox air conditioner which failed.

When temperatures get high and the heat becomes unbearable there’s nothing worse than an air conditioner that isn’t blowing cold air. When your air conditioner isn’t working properly in the middle of summer it can lead to a home that’s extremely uncomfortable for you and your family.

Luckily, most problems with your air conditioner can be fixed by a certified HVAC technician and you can have your home nice and cool again in no time. So, don’t put off fixing your air conditioner. Get to the bottom of the problem and hire a professional to help you resolve it before your home starts to feel like a sauna.

Here are the eight most common reasons why an air conditioner isn’t blowing cold air.

Power Issues

Like any appliance, an air conditioner requires power to operate. It also relies on a number of electrical components to function correctly. If something goes wrong to prevent your unit from receiving power, or any of its electrical components fail, it can cause serious issues.

Some common electrical issues to check for include sensors that aren’t working correctly, corroded contacts or connectors, broken or shorted wires, and defective circuit breakers. Any of these problems could be the reason why your air conditioner isn’t blowing cold air.

As with any sort of electrical work, make sure to call a professional to ensure repairs are carried out properly and safely.

Thermostat Issues

If you’re having problems with your air conditioner it may actually be your thermostat that’s malfunctioning. Your thermostat is the device used to control your air conditioner and it’s what sends the signal to your air conditioner to turn on when it starts to get too hot. So, if it’s not working your air conditioner won’t work either.

In order to check your thermostat, start by making sure your air conditioner is turned on. Then set the temperature on your thermostat to a few degrees below the current temperature of your home. If your thermostat is working correctly this should cause your air conditioner to come on.

If nothing happens when you do this it likely means there’s something wrong with your thermostat and you’ll need to call an HVAC technician.

Dirty or Clogged Filter

Every air conditioner is fitted with an air filter that prevents dirt and debris from getting inside the unit. However, if the filter isn’t changed or cleaned it will eventually get clogged, limiting the airflow inside the air conditioner and causing it to malfunction.

If your air conditioner isn’t blowing cold air make sure to check your air filter to see if it’s clogged. Some filters can be cleaned while others need to be replaced. Refer to your owner’s manual if you’re unsure what type of air filter you have.

To keep your air conditioner functioning properly, make sure to change or clean your air filter every 90 days.

Ice Buildup

If you find that your air filter is clogged it’s quite likely that your air conditioner is also suffering from ice buildup. When the airflow inside your unit is restricted the evaporator coils can become too cold, which can lead to frost. This is one of the leading causes of an air conditioner not blowing cold air.

Changing or cleaning your air filter should resolve this issue. It’s also a good idea to clean your evaporator coils with a soft brush, soap, and water. This will clear away any debris and help them function properly.

Clogged Drain

Through the process of cooling the air in your house, your air conditioner also removes moisture from the air. This moisture is drained out of the unit through a pipe or hose to prevent it from building up. However, if the drain becomes clogged it can cause your air conditioner to shut down.

It’s not uncommon for algae to start growing inside pipes and hoses, which often leads to clogs. Inspect your drainage system and if you find any algae you should be able to get rid of it by flushing the system with a bleach solution.

If there’s a more serious issue with your drainage system it’s possible you may need to call an HVAC technician to replace it.

Compressor Issues

The compressor plays a critical role in the heat exchange process. If this component isn’t functioning properly your air conditioner won’t blow cold air. The most common reason the compressor stops working is that it’s become dirty or clogged.

Inspect your condenser and make sure there isn’t any nearby vegetation interfering with it. Clear away any foliage that’s getting too close and ensure there’s at least a foot and a half of space between the condenser and any vegetation.

Next, clean the condenser with soap and water to remove any dirt and debris. If you want to prevent your condenser from getting too dirty in the future speak to an HVAC technician about installing a cover over it.

Low Refrigerant Levels

Air conditioners use refrigerant to cool the air inside your home. While refrigerant doesn’t ever need to be replaced, if your unit springs a leak it could cause your refrigerant levels to drop. When it loses too much refrigerant an air conditioner won’t absorb heat properly and will no longer be able to cool the air.

If your air conditioner is low on refrigerant you’ll need to get it recharged. This procedure needs to be performed by a certified HVAC professional. You’ll also want to make sure the leak is repaired as well.

Contact Us Today for All of Your HVAC Needs

Romaniuk has been serving the greater Edmonton area for over 30 years. Our team of certified experts is ready to help you with all of your HVAC needs. If your air conditioner isn’t blowing cold air, or you’re experiencing other issues with your HVAC system, call us today at 587-400-7333.