How To Install A Portable A/C In A Horizontal Sliding Window?

Welcome to our blog post on how to install a portable air conditioner in a horizontal sliding window! As the temperatures rise, finding effective ways to beat the heat becomes a top priority.

If you have a horizontal sliding window and are considering investing in a portable air conditioner, you’re in the right place.

In this guide, we will walk you through the step-by-step process of installing a portable AC unit in your window, ensuring that you stay cool and comfortable all summer long.

By the end of this article, you’ll have a clear understanding of the key considerations and techniques involved, enabling you to tackle the installation with confidence. So, let’s dive in

Here’s How You Do It

Following are a series of steps you need to follow in order to install a portable air conditioner in a horizontal sliding window.

Step 1: Gather Equipment 

Make sure you’re equipped with all the necessary gear to kickstart the installation process. You’ll need a window kit, the AC unit itself, and optionally some duct tape.

Take a moment to inspect your installation kit and ensure it contains all the essentials like a window kit, screws, duct connectors, and an exhaust hose.

Step 2: Location Checklist

Make sure the spot you chose has ample space for proper air circulation. Also, make sure the distance between the air conditioner and the electrical outlet is balanced.

Oh, and don’t forget to consider the height of the window – you don’t want it too high for the exhaust hose to pass through smoothly.

Step 3: Remove Existing Seals

Use a screwdriver to remove existing weather-strips or rubber seals from the sides and top of the window if any exist, as they will interfere with the installation of your portable air conditioner unit.

Step 4: Install the Supplied Window Bracket

Place the top part of the bracket into position at the top of your window and fix it securely with the screws provided in your installation kit. Attach the alternate part of the bracket at the bottom side of your window in a similar fashion.

Step 5: Connect the Exhaust Hose

Once the window kit is in place, connect one end of the exhaust hose to the connector on the adjustable panel. Make sure it fits tightly and securely to prevent any air leaks.

Step 6: Extend the Exhaust Hose

Extend the exhaust hose to its full length and position it towards the window. You may need to adjust the length to fit your window properly. Avoid bending or kinking the hose, as it can obstruct the airflow.

Step 7: Secure the Exhaust Hose

To secure the exhaust hose to the window, you have 3 options;

  • Option 1:Some portable air conditioners come with a window bracket that helps support the weight of the hose and keeps it in place. Attach the bracket to the window frame or sill, and then rest the hose on it. Make sure the bracket is securely attached and can support the weight of the hose.


  • Option 2: If you don’t have a window sealing kit, you can purchase one specifically designed for portable air conditioners. These kits usually include a bracket and a window seal. Install the bracket as instructed, and then use the seal to cover any gaps around the hose in the window opening.


  • Option 3: If you don’t have a window bracket or sealing kit, you can use other materials to secure the hose. For example, you can use foam insulation or weather-stripping to create a seal around the hose in the window opening. You can also use tape or zip ties to fasten the hose to the window frame, making sure it is stable and doesn’t sag.

Step 8: Test for Air Leaks

Once the exhaust hose is secured, turn on the portable air conditioner and check for any air leaks around the window. If you feel any warm air coming inside or notice gaps, use additional foam or weather-stripping to seal them.


There you go, you are now armed with information on how to install a portable air conditioner in a horizontal sliding window. If you have any tips or tricks it make this process easier make sure to leave it down in the comments below.

We hope that this article has provided you with valuable insights and practical instructions to successfully complete the installation process.

Remember to refer to the manufacturer’s instructions for your specific portable air conditioner model, as the installation process may vary.

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