The air conditioner works when the window is open. What is the risk?

Often there are situations when the air conditioners are working and the windows are open wide. You will have to choose what is more expensive for you: air conditioner or open windows. After all, this is one of the most common mistakes that many air conditioning users make. In this article, we will explain in detail why you should not use an air conditioner if the windows are open in the room, and in which cases.

5 reasons not to open the windows when the air conditioner is running

Why can’t I open the windows when the air conditioners are on? We will tell you about at least five reasons that are worth considering. Of course, you do not have to follow these recommendations, but we advise you to take them into account in order to save time and money in the future.

Reason #1. Electricity overruns

cost of aie conditioner

If a classic non-inverter air conditioner is installed in your home or office, then you should take into account that it does not work on a permanent basis, but only at those moments when the temperature in the room rises above the set one. The rest of the time, he just «drives» the air around the room.

When the windows are open, the temperature in the room is guaranteed to change, special sensors on the air conditioner will record these changes and the device will automatically start working in enhanced mode. In this case, the device will start to consume more electricity than usual. As a result, you will be unpleasantly surprised when you receive a utility bill.

Reason #2. Dust

The air in modern cities is far from ideal. It is filled with dust, which quickly settles on the filters of your air conditioner, getting into the room from the constantly open window. The filter is designed for only a small amount of dust, which is always present in the air. It will not cope with the polluted air coming from the street. And as a result, you will breathe dust that the filters could not contain.

Reason #3. High probability of breakdowns

disassembly of the air conditioner

As we said above, with the windows open, the air conditioner works more actively than usual, since it must constantly lower the temperature due to the warm air from the street entering the room. This means that with such intensive work, the main components of the air conditioner suffer. If you regularly use the air conditioner for wear, you risk putting it out of order.

Reason #4. No warranty

Some manufacturers explicitly state that with regular airing, the service life of the air conditioner is reduced and if the device breaks down, then you can pass it for repair under warranty. You may be lucky, and the service center staff will not know about your mistake, but often the internal state of the air conditioner can track how intensively it was used.

Reason #5. Cold

how not to get sick from the air conditioner

An open window in combination with a working air conditioner often leads to a draft, and at the same time to a cold. Of course, a person with excellent immunity is unlikely to have problems with this. But let’s be honest, which one of us has perfect health? We all breathe exhaust fumes from cars on a daily basis, eat improperly, and spend little time on sports.

In this case, colds can not be avoided. If you have only once sat in a room with a constant temperature fluctuation and a draft— this is one thing. Most likely, it will even benefit you. But if you work or relax in such a room every day, you will most likely get sick.

But what if the window needs to be opened?

Regular ventilation is the key to good health, so you still have to open the windows several times a day.


If you can’t live without a constant supply of fresh air, but at the same time you want to keep the air conditioner and your wallet safe and sound, follow these simple recommendations:

  • Do not open the windows wide, use micro-ventilation;

  • Arrange additional supply ventilation in the room;

  • Instead of one open window, open several windows for micro-ventilation;

  • If there is still not enough air in the room, you can open the window wide, but not for more than 2-3 minutes.


In this article, we have given at least 5 reasons why you can not turn on the air conditioner with the windows open. Of course, if you take into account all the features of the split systems, you can open a window in the room, but not for long. We recommend that you do not use the device in a room with open windows. This way you will increase its service life and save your health.

And what recommendations can you give for those who like to air with the air conditioner on? Share your tips on the proper operation of split systems.

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