Technician in white shirt examines an air conditioner blowing warm air outside a customer's house.

Picture this: It’s a hot summer day in Wisconsin, and you’re looking to take a break from the heat in the comfort of your air-conditioned home. There’s only one problem—your AC is acting more like a furnace. So why is your air conditioner blowing warm air? Let Advanced Comfort Systems help. Below, we’re sharing some common reasons why this problem occurs (and call us to help you fix it if need be).

Your Air Conditioner Drain May Be Clogged

When your AC drain gets clogged, your unit could either blow warm air or stop working altogether from its mechanical safeguard. Mold and mildew tend to build up over time, especially in older units. You can often find signs of a clogged AC drain by looking to see if any water is pooling around the unit or the safety switch.

If that doesn’t appear to be the culprit, there are some DIY fixes you can use, such as using a wet/dry vac to suction out potential blockage from the AC drain condensate line. Be sure to wear hand and eye protection attempting this solution, and never perform any sort of AC maintenance unless you’re comfortable doing so.

The best—and easiest—thing you can do to avoid issues is to keep the area around your air conditioner free from debris and other potential blockages. Your unit will only provide cool air if it has a consistent, clear pathway in place. So, get those leaves, sticks, and shrubs out of the way.

Your Air Conditioner’s Refrigerant Is Low (or Leaking)

Air conditioners are programmed to run with a specific level of refrigerant, which helps absorb the heat and send it outside. But leaking refrigerant can lead to problems like a frozen evaporator coil. And running your unit on a low refrigerant charge can lead to unnecessary stress, compressor damage, or even system failure.

Our licensed technicians can stop a refrigerant leak in its tracks or refill it according to today’s EPA standards if needed.

Your Air Filter Is Dirty

Filters should be inspected monthly and changed as needed. If they aren’t, dust, dander, and other debris will collect, limiting airflow and lowering the unit’s internal temperature. You might even experience hot or cold spots throughout your home. Higher MERV (Minimum Efficiency Reporting Value) filters are great for catching more particles related to air quality and can be replaced every six to 12 months.

Remember that a dirty air filter isn’t a bad thing—it means it’s working as intended. If your air filter tends to be always clean, you may have installed it the wrong way or used an improperly sized filter. The next time your Advanced Comfort technician is over, ask to see the right way to install an air filter.

Did You Check the Thermostat Setting?

Believe it or not, this is a common error in households, especially for frugal homeowners who might have delayed turning on their air conditioner to save some money. Do a quick double-check and make sure the thermostat is set to “COOL,” and your comfort is going to get a lot better.

Call the Air Conditioning Professionals at Advanced Comfort

Is your air conditioner blowing warm air, even after utilizing our tips? Call the experts at Advanced Comfort, a Carrier® Factory Authorized Dealer, for a thorough inspection or preventative maintenance tune-up at 920-564-2333 (or contact us).

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