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Why Is My AC Not Blowing Cold Air?

A woman sitting at an office desk holding a water bottle up to her right cheek and fanning herself with a fan in her left hand.

In some parts of Colorado, daily temperatures exceed 90 degrees Fahrenheit during June, July, and August. Despite its elevation, even Denver has average summer temperatures in the mid-80s. No matter where you live, you need a functioning HVAC system to keep you cool and comfortable. But what if you’re dealing with an AC that is not blowing cold air?

An AC unit not blowing cold air is one of the most common problems during summer. In this blog, we’ll go over some reasons your AC could not be blowing cold air, including:

Need AC repairs or maintenance?

Cooper Heating & Cooling offers high-quality AC repair and AC tune-up services, making it easier to keep your HVAC system in tip-top shape. If your air conditioner won’t turn on, runs longer than expected, or blows warm air instead of cold air, contact us to schedule an appointment. We’ve been in business since 1978, so we have experience working with AC units from every major manufacturer.

Wrong Thermostat Settings

When you set your thermostat, you choose a control setting based on your budget and personal preferences. For example, if you’re trying to reduce your utility bills, you may set the thermostat a few degrees higher than usual to save energy. If you’re extremely sensitive to high temperatures, you may be willing to pay more to keep your home comfortable.

You will also want to check your settings to ensure your system was not changed to heat or fan only. This can happen depending on your programming or someone changing the setting manually on your thermostat.

If the AC is not blowing cold air, the first step is to see if someone in your household adjusted the settings without your knowledge. If you set the thermostat to 68 and your spouse came along and changed it to 72, it will stop blowing cold air once it reaches a higher temperature.

If the control setting is correct, you may have a faulty thermostat. One of our highly trained technicians can test the thermostat and replace it if necessary.

Clogged Air Filter

Dirty air filter sitting on a white tabletop.

The air filter protects your AC unit and furnace by keeping pollen, dust, insects, pet dander, and other particles out of its mechanical components. Filters also promote air circulation, preventing an AC unit from overheating or wearing out prematurely. If the filter has a clog, air can’t circulate freely, making it more difficult for your HVAC system to keep your home cool.

If you’re concerned about an AC not blowing cold air, check the filter to see if it’s clogged with dirt, leaves, or other particles. To remove excess debris, follow the manufacturer’s cleaning instructions. For reusable filters, you may be able to vacuum the filter or wash it with warm water and dish soap. For replacement filters, it will need to be replaced.

If you don’t feel comfortable removing the filter or cleaning it yourself, sign up for our AC tune-up service. During each maintenance visit, one of our techs will replace your air filter, eliminating the need to check it for clogs. As a bonus, replacing your AC air filter reduces energy usage by as much as 15%.

Dirty Evaporator Coil

Closeup of a dirty evaporator coil

The evaporator coil is one of the most important parts of an AC unit, as it absorbs heat. Many people confuse the evaporator coil with the condenser coil. Both are important, but they have different functions. While your evaporator coil is located indoors, normally attached to your furnace, and absorbs heat, the condenser coil releases heat outdoors. These components work together to keep things cool.

If your AC is not blowing cold air, you may have a dirty evaporator coil. When condensation forms on the dirt, it freezes, causing frost to build up. This prevents the evaporator coil from absorbing heat as intended. In addition to a lack of cold air, this AC problem may cause the following symptoms:

Cooper Heating and Cooling has been in business for over 40 years, so we have the knowledge and skills to diagnose a dirty evaporator coil and get your air conditioner up and running as quickly as possible.

Refrigerant Leak

Refrigerant is a chemical that starts as a liquid, turns into a gas, and then turns back into a liquid. The properties of this chemical make it ideal for absorbing and transferring heat. If your AC unit is not blowing cold air, you may have a refrigerant leak. These leaks occur when holes or cracks form in the unit’s linesets or coils.

Although refrigerant is useful, it’s hazardous if handled improperly. Therefore, hiring a trained professional to fix the link and top off your refrigerant levels is important. We offer fast and convenient scheduling to get your AC unit up and running immediately.

Malfunctioning Outdoor Unit

A central air conditioning system differs from a standard window unit as it has indoor and outdoor components. The condenser unit sits outside, releasing heat into the air instead of returning it to your home. If your AC is not blowing cold air, there could be a problem with the outdoor unit, preventing it from releasing heat. For example, the outdoor unit might have a broken fan or compressor. These issues would need to be properly diagnosed by a professional to ensure the right component it identified and repaired or replaced.

Do you need help with an AC unit that’s not blowing cold air?

Contact Cooper Heating & Cooling to request an estimate. Thanks to our 1‑year labor warranty and 100% customer satisfaction, we have thousands of 5‑star reviews from people like you.

Luke Cooper

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