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Is It Bad To Leave My Windows Open With The AC On?

May 27, 2022

By Air-Master Heating & Air Conditioning

Reasons Why You May Want To Close Your Windows

The heat approached quickly this May and most of us have already cranked up our air conditioning. As the heat cools down at night, many want to let in the fresh air and open up a window or two. But the question that crosses everyone’s minds before doing so is “Is it bad to leave my windows open with the AC on?” Unfortunately, opening your windows with your air conditioner running can only cause more problems, and here is why.

Your Air Conditioner Works Harder

Your air conditioner works hard to keep your home cool, and opening a window lets out the cool air. You may find yourself adjusting the temperature before bed, which is causing your air conditioner to run until it meets the cool temperature again. If the windows are open, the cool air is continuously leaving through the window and your air conditioner never stops running. The constant usage can shorten the lifespan of your unit.

Damage to the Air Conditioner

Due to your air conditioner working harder with the windows open, it can cause wear and tear and other damage. The humidity from the outdoors is let in through windows, which is another factor your air conditioner has to work to decrease.

Higher Energy Bills

Leaving your windows open with the air conditioning on can increase your energy bills. Your unit is constantly running, therefore using more energy and raising your monthly bill.

Poor Air Quality

If you or someone in your home is prone to allergies, opening a window can let in outdoor pollutants your air filter has worked to keep out. Dust is one of the pollutants that can enter your home and clog your air filter. This will cause you to have to change your air filter more often. Dust can also coat exposed parts such as the evaporator coil, which slows the cooling process.

Irregular & Delayed Cooling

As cool air escapes, it will take more time to cool your house to the desired temperature. If the thermostat is near the open window, that room will be impossible to keep cool due to air constantly flowing in. Open windows can create dissimilar temperature zones within your house.

Although you are letting the breeze of the summer night in with the window open, you are letting your air conditioning out. This is a common homeowner mistake.We suggest keeping your windows closed this summer season in Bedford to keep you cool and maximize your air conditioning unit’s efficiency!

Our Service Area

Serving all of Lawrence County and surrounding areas


Air-Master Heating & Air Conditioning is a locally owned and operated company proudly serving all of Lawrence County, Indiana. If you don't see your location listed on here, give us a call at (812) 279-0509 to verify if we serve your area. 

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2310 Industrial Dr
Bedford , IN 47421

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