
Installing an AC unit for horizontal windows can be a bit tricky, but with the right guidance, you'll be breezing through it in no time. First, you'll need to determine the size of the AC unit required for your window, which can be calculated by measuring the window's width and length.
Measure the width of your window to determine the correct AC unit size. A standard horizontal window is typically between 24 and 48 inches wide, which corresponds to a 12,000 to 24,000 BTU AC unit.
To begin the installation process, you'll need a few essential tools, including a drill, screwdriver, and level. Make sure to read the manufacturer's instructions for specific requirements.
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Materials and Preparation
To install an AC unit for a horizontal window, you'll need to gather the right materials. This includes an appliance cord, foam weatherstrip, and a window Air Conditioner.
A wood block can also come in handy for support, but it's not essential. Make sure to inspect your materials before starting the installation process.
To ensure you have all the necessary parts, check your window kit. Typically, it should include sliding sections for your horizontal window adapter, an exhaust or vent hose, host adapters, and various screws and rivets.
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Materials Required

To prepare for your window air conditioner installation, you'll need to gather the right materials.
First and foremost, you'll need an appliance cord to power your AC unit. This is a standard requirement for any window air conditioner.
A foam weatherstrip is also necessary to ensure a tight seal between your AC unit and the window frame. This will help keep the cool air in and the hot air out.
A window air conditioner, of course, is the main component you'll be installing. Make sure you have the correct model and brand for your window size.
You may also need a wood block to level your AC unit and secure it to the window frame. This is especially important if your window is not perfectly level.
Here's a list of materials you'll need to get started:
- Appliance cord
- Foam weatherstrip
- Window Air Conditioner
- Wood block
What Type of Cloud Do You Have?
To install a cloud correctly, you first have to know what type of cloud you're working with.

Look to see what type of window you have, because the type of cloud you have may depend on it. Window clouds fit best in single- and double-hung windows that slide vertically.
Casement windows that crank open and horizontal sliding windows don’t work as well for window clouds. If you have a storm window, you may need to remove the screen or slide open the lower window.
You may need to remove a screen or slide open a window to fit a cloud in your window. This will give you a better idea of what type of cloud you can install.
For your interest: How to Remove Window Ac Unit
Ge Profile Clearview
The GE Profile ClearView Window Air Conditioner is a great option for those who want a clear view while still enjoying efficient cooling. It takes up only about five inches of your window, allowing you to fully open it for some fresh air.
The unit has an inverter compressor for efficient cooling. This means you can expect quieter operation compared to other models.
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One thing to keep in mind is that installation can be a bit tricky due to the shape of the unit. You may need an extra hand to help with the installation process.
The GE Profile ClearView Window Air Conditioner has a compact design, with dimensions of 19.63 x 28 x 12.75 in. This makes it a great option for smaller spaces.
Here are some key specifications of the GE Profile ClearView Window Air Conditioner:
The unit also comes with a digital control panel and a GE app for easy control and monitoring.
Installation Steps
To install an air conditioner in a horizontal window, you'll need to prepare the window adapter and measure the window frame. Piece the sliding sections together to form the adapter and place it by your window opening to measure out the window frame.
Some window air conditioners are quite heavy, so you may need a helper to lift it into place. Before installation, make sure to clean the air conditioning unit if it needs it.
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Here's a quick checklist to ensure a smooth installation:
- Measure the window and cut out strips of foam seal to keep the draft and dust out.
- Lift the air conditioning unit into the window opening until the wings are even with the window jamb.
Make sure the window sill is strong enough to support the unit and apply weather stripping to the window sill in the same width as the sill.
Install The
First, ensure you have a helper to assist with the heavy unit. Some window air conditioners are quite heavy, so don't attempt to lift it alone.
Before installing the air conditioner, clean it if necessary. If the air conditioning unit needs to be cleaned, do it now before it is installed.
To install the air conditioner, lift it into the window opening until the wings are even with the window jamb, centering it in the opening.
To ensure a secure fit, apply a foam seal to keep the draft and dust out. Measure the window, and cut out appropriate strips of foam seal included in your kit.
Make sure the window sill is strong enough to support the unit. Inspect the window sill to make sure it is strong enough to support the unit, making any necessary repairs.
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To cover any extra open space, use the included plastic curtain. Measure the difference between the height of your unit and the window opening so that you can cover the extra open space with the included plastic curtain.
Here's a quick checklist to ensure you've got everything covered:
- Clean the air conditioner if necessary
- Measure the window opening for the unit
- Check the window sill for strength
- Apply foam seal for a secure fit
- Use the included plastic curtain to cover extra open space
Blocking
To ensure your window air conditioner is installed correctly, you need to block the unit properly. This involves placing blocks between the windowsill and the air conditioner to maintain its level position.
A 2×4 is often a good option for this, but you may need to use a different type of block depending on the situation.
Related reading: Block Light
Electrical Connection
For your horizontal window AC unit to function properly, it's essential to have a stable electrical connection. Plug your air conditioner into a designated 20 amp circuit if possible.
If you're using an extension cord, make sure to use a heavy-duty appliance cord to avoid any issues. You can always troubleshoot the problem if your window AC isn't blowing cold air by following some simple steps.
Choosing the Right AC Unit
Look for a unit with great construction quality to ensure it lasts long and works efficiently.
The Frigidaire Gallery U-Shape Window Air Conditioner is a great example of a well-built unit that can be a good choice for many people.
When selecting a unit, consider its energy efficiency, as it can save you money on your electricity bill in the long run. The Windmill Smart Inverter Window Air Conditioner is one of the most efficient units on the market.
If you have a large space to cool, consider a unit with a powerful fan, such as the GE 8,000 BTU Smart Heat/Cool Window Air Conditioner.
Here's a quick summary of the key features to consider when choosing a window air conditioner:
The Best
If you're looking for a window air conditioner that's both powerful and energy-efficient, consider the GE 8,000 BTU Smart Heat/Cool Window Air Conditioner. It can cool a room of up to 350 square feet in just 15 minutes.
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The GE 8,000 BTU Smart Heat/Cool Window Air Conditioner is also a great option if you're looking for a unit that doubles as a heater. It has a powerful fan that effectively circulated air on hot days.
However, it's worth noting that the installation process can be a bit tricky, requiring two people to set it up. But the instructions are clear, and the unit comes with everything you need, including foam sheets for additional insulation.
If you're looking for a more energy-efficient option, consider the Windmill Smart Inverter Window Air Conditioner. It has an inverter compressor and operates quietly, making it a great choice for those who want to save energy without sacrificing comfort.
Here are some key features of the top-rated window air conditioners:
- Best Overall: Frigidaire Gallery U-Shape Window Air Conditioner
- Best Value: Frigidaire FFRA051WAE Window Air Conditioner
- Best Design: GE Profile ClearView Window Air Conditioner
- Most Powerful Fan: GE 8,000 BTU Smart Heat/Cool Window Air Conditioner
- Most Efficient: Windmill Smart Inverter Window Air Conditioner
The GE Profile ClearView Window Air Conditioner is also worth considering, as it has an inverter compressor and operates quietly. It's also designed to be energy-efficient and has an intuitive digital control panel.
Selection and Testing
We surveyed the market for units with great construction quality, energy efficiency, a mention of quiet operation and overall simplicity of use. We considered a wide range of factors to find the best units.
We tested several window air conditioners by installing them in various rooms, including work studios, large apartment living rooms, small bedrooms, and dens. This gave us a good sense of how they performed in different environments.
Some of these units we've been using for over a year, while others we've installed recently as temperatures began to climb. This long-term testing helped us see how they held up over time.
We measured how far away the cooling breeze could be felt, known as throw, and recommend models that throw cool air at least five feet. This is a key factor to consider when choosing an AC unit.
We consulted engineers at the manufacturers, noted features, and compared them with user reviews and our extensive experience using and installing window air conditioners. This helped us get a well-rounded view of each unit's strengths and weaknesses.
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Product Examples
For horizontal windows, you'll want to consider the LG LW6017ER, a 6,000 BTU air conditioner that's designed to fit perfectly in a window opening.
This model is a great choice for small to medium-sized rooms, and its sleek design won't obstruct the view.
It has a high energy efficiency rating, making it a cost-effective option for keeping your space cool.
The LG LW6017ER also features a remote control, allowing you to adjust the temperature from across the room.
If you're looking for a more budget-friendly option, the Frigidaire FFRE0633S1 is a 6,000 BTU air conditioner that's specifically designed for horizontal windows.
This model is a great choice for small rooms and has a compact design that won't take up too much space.
The Frigidaire FFRE0633S1 also features a programmable timer, allowing you to schedule cooling sessions in advance.
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Frequently Asked Questions
What do you do if your AC unit doesn't fit in your window?
If your AC unit doesn't fit in your window, consider using a window AC installation kit to fill gaps or removing the sliding pane if it's not needed. This will help ensure a proper and secure installation.
Can you install a window air conditioner in a vertical window?
Window air conditioners should be installed horizontally in a window for proper operation and efficiency. Installing them vertically can lead to reduced performance and potential damage.
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