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Can You Install a Window AC Sideways?


Window air conditioners are designed to fit snugly into a window frame in the horizontal position, with the hot air exhaust vent on top and the cold air intake vent at the bottom. This orientation is recommended for optimal performance.

However, there can be cases where your chosen window AC may not fit in the space of your window. With such a dilemma, you may have asked yourself, is it possible to install a window AC sideways or vertically, instead of in its intended position? Read on to learn the answer.

Is It Possible to Install a Window AC Sideways?

It is possible to install a window air conditioning unit sideways, but it is not recommended by the manufacturers. This type of installation takes away from the efficiency of the unit because they are designed to be installed with airflow downward. If you do decide to install your window AC sideways, then make sure that the outer part will still be able to fit through the window frame.

Additionally, it is important to ensure that the outside portion of the unit is securely fastened so that it does not become loose over time. It is always better to follow the manufacturer’s installation instructions. If you have any doubts about whether your unit should be installed sideways, consult a professional for advice.

Installing an air conditioning unit is a serious business and should not be taken lightly. With the right precautions, you can have a properly installed window AC unit that runs at optimal levels of efficiency.

Installing Window AC Sideways

If you truly have no other choice but to install a window AC vertically, there are several important considerations that you must think through before you do so.

If you’re installing a window AC unit sideways, make sure that the outside part of the unit fits snugly in the frame of your window. Ensure that there are no gaps or spaces between the frame and the unit itself. Additionally, you should always use anchors to securely fasten the outside portion of the unit to your window frame. This will help the unit remain stable and secure over time.

Next, make sure that the location of the hot air exhaust vent is not blocked. If possible, position the hot air exhaust vent pointing away from the window so that the hot air is not re-circulated into your home.

Finally, when installing a window AC unit sideways, ensure that the airflow is directed downward. Even though the unit may be installed in a sideways position, you should always try to orient it so that the cold air intake is at the bottom and the hot air exhaust vent is at the top. Doing so helps in ensuring that your unit runs efficiently and as expected.

Final Thoughts

A window air conditioning unit is meant to be positioned horizontally. While it is possible to install it vertically, it is not recommended to do so as it can have an effect on the efficiency of your unit. Not only that but positioning your window AC sideways may also cause accidents in the future.

Instead, you may want to look into window AC units that are specifically designed to be positioned vertically. If you have no other choice in the matter and have to use your existing window AC, keep in mind that there are several conditions you have to consider before installing your unit sideways.

At the end of the day, it is always best to follow the manufacturer’s instructions on how to install your air conditioner properly.

For more air conditioner guides, just visit our website, Aircon Experts.

JP Reyes

JP has been in the aircon industry for almost as long as he has been alive. As a child JP would help his tatay fix aircon units at their junk shop in Cavite. After graduating UP in the early 2000's, JP then started his own Aircon servicing business and within 5 years had 10 shops in 8 different cities. Fast forward to today and JP brings all his experience and expertise online to give readers trustworthy advice and reviews about Air-conditioning buying, servicing, cleaning and repair in the Philippines.

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