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The Best Way To Install AC In A Horizontal Sliding Window

The Best Way To Install AC In A Horizontal Sliding Window

Our home has several horizontal sliding windows, particularly in the rooms. This method of installing an air conditioner is straightforward, but you must remember to gather your tools and prepare beforehand. Here is what we determined after consulting with specialists in the field.

Keep these suggestions in mind:

  • Verify the air conditioner’s length and width.
  • Take the window screen off.
  • Trim the wood, then assemble the frame.
  • Put the frame together.
  • Open the window by moving the panel.
  • Plug in your device.

Typically, window air conditioners cannot be used with sliding or double-hung windows. To accomplish your goal, simply follow a few easy procedures while installing your air conditioner.

Setting Up Your AC

A number of air conditioners could be installed in your sliding window. Before purchasing an air conditioner, measure the window opening so you’ll know how wide a unit you can install. Here, you can find comprehensive instructions for setting up your air conditioner in a horizontal sliding window.


The Best Way To Install AC In A Horizontal Sliding Window

The width of your air conditioner must first be determined, taking into consideration any side outlets that protrude. After then, don’t forget to compute and estimate the height. This size must also take into account the height of the frame, excluding the top and bottom lips.

Window Frame And Screen

By sliding the frame, one side of the sliding window can be entirely opened. Window screens that are used to keep out dust or insects should be removed.

Check out the windowsill as well. If the windowsill is old, weak, or damaged in any other way, it might not be able to support the weight of the unit. Alternately, change the window or the windowsill.

Frame And Wood

First, cut the lumber to the required length and width. After that, use your dimensions as a guide. The tips of the long slabs should be secured to the smaller two-by-four slab that has been placed on the ground.

Use two deck screws at each connecting point, keeping in mind the depth of the board. To make a rectangle, sandwich a small two-by-four between the long ones on the opposite end. Make sure the edges are square to start.

Assemble The Frame

After cleaning, position your air conditioner in the frame with the bottom of the unit facing the outside. Most commonly shaped like a U, the back half of the upper lip is slightly shorter than the front.

Place the final two-by-four piece on top. But don’t tighten it just yet. Tilt the air conditioner so that the front corner of the wooden frame and the forward upright portion of the upper lip are appropriately aligned.

Set Up Your AC

Gently open the window and move the inside panel to the other side of the window frame to complete the installation.

Fasten it by driving long screws through the piece of wood and into the frame that surrounds the window hole if you wish to increase stability.

Slide the air conditioner into the window opening once it is flush with the side window jamb and leans against the support bracket. You should have help because the unit will be hefty.


The Best Way To Install AC In A Horizontal Sliding Window

Finally, connect your device and check that it is functioning properly. Check your installation to see if there are any misaligned or loose parts, and make the necessary changes if your equipment isn’t working properly. To allow the cool air from your air conditioner to flow through any holes in your frame, don’t forget to seal them.

How Are Window Air Conditioners Supported?

Window air conditioners won’t fall if they are installed properly. To create a comfortable breeze, window air conditioners can be put in an open window, but the larger units need to be supported for safety. We looked into the best advice for you.

Here are the procedures for building a window air conditioner support:

  • Check the size of the window particularly the width.
  • Mark the width of the channel on the lumber.
  • On the four-inch face of the timber, draw the channel depth.
  • Glue the wood to the window frame.

People who are unaware of this extra support run the risk of exiting the AC. We will go over how to seal the gap between the window and the air conditioner so that the frigid winter wind won’t get inside your apartment. Continue reading as we go deeper into this topic.

Buying AC Brackets

The Best Way To Install AC In A Horizontal Sliding Window

You can buy AC brackets from appliance merchants, but there is no guarantee that they will fit your air conditioner’s size. It is more practical to make your own air conditioner supports because you may change the size and save money. The steps for constructing AC support are listed below.

Width Of The window

After taking into account the width of the window, measure the depth and width of the channel in the window frame through which the slides pass. On the lumber, mark with a pencil the width of the window. Then, using the jigsaw, cut the timber to the window’s width as shown by the outline.

The Channel’s Width

Mark the width of the groove on the wood’s four-inch face. It needs to be finished on both ends, with a pencil mark indicating the breadth at each end. Given that a channel normally has a half-inch width, you are more likely to leave a half-inch mark on both ends.

Depth Of The Channel

Mark the top and bottom edges of the timber’s four-inch face with a pencil to show the depth of the channel. Next, etch marks on the top and bottom edges that are equal to half the depth of the channel. The lines drawn in this phase should be parallel to the lines drawn in the stage before.

Glue The Lumber

Place the lumber on the lowest part of the windowpane and your air conditioner is ready to be placed through the window. It would be ideal if you placed the lumber directly over the air conditioner, but you can alter it if necessary. Make sure the air conditioner’s top lip is pressing on the wood.

Is It Okay To Put An AC In Sideways?

There are various sizes of air conditioners; some can cool entire buildings, while others are little machines for a single room. Even so, no matter how small, some windows can be broader than certain air conditioners. Can this be quickly fixed by tilting the air conditioner?

An air conditioner cannot be operated sideways because that is not how it is designed to function. Components like condensate drains will stop working if they are turned sideways. The compressor is more important since it will soon fail and may catch fire if it explodes as a result of inadequate or subpar maintenance.

If you set the window air conditioner sideways on a window sill, the compressor, fans, and other window AC parts should still work just as well because they are not gravity-dependent. Continue reading as we discuss the drawbacks in great detail.


The evaporator sends vapor to the compressor. The compressor is necessary to shrink and compact the vapor. As a result of compression, the vapor is released from the compressor at a pressure and temperature that are much higher than those at which it was released from the evaporator.

Air conditioners for windows are designed to stand upright. It was assumed that you would operate a window air conditioner upright and in the proper posture while designing all of the internal supports.


The refrigerant loses heat to the atmosphere while a fan blows over the condenser. Because it is at a higher pressure and temperature than the outside, it condenses into a liquid. A window air conditioner can momentarily run in the other direction. It’s unclear what would happen (and for how long) if you used a window air conditioner upside down.

Expansion Valve

Just in front of the expansion valve is the evaporator. Its purpose is to reduce the condensed refrigerant’s pressure so that it will boil when it enters the evaporator and absorb heat from the air, turning it into vapor and restarting the cycle.

In general, window air conditioners can still work even when placed horizontally (as long as no airflow is obstructed). Vertical installation of a window air conditioner is not recommended.

To Wrap Up

To install an air conditioner on horizontal sliding windows, you must learn six different techniques. Never forget your tools and materials, such as wood, screws, and similar items. Despite the ease of installation, you must be aware of the type of air conditioner you currently have.

The Best Way To Install AC In A Horizontal Sliding Window

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Written by HVAC Contributor

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