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Through The Wall Air Conditioner Installation: Step-By-Step Guide

Note: This post may contain affiliate links. This means that at no cost to you, we may receive a small commission for made purchases.

Through the wall AC systems are becoming very popular because they save space and reduce energy consumption.

They are also easier to install. The only problem is that they are quite expensive.

Through The Wall Air Conditioner Installation: Step-By-Step Guide

The price of a through-the-wall air conditioner installation depends on many factors, including the size of your home, how far you live from the nearest power source, and whether or not there are any obstructions in your house.

The average cost for an air conditioning installation through the wall can range anywhere between $1,000-and $3,500.

This will depend on the type of system you choose, as well as the amount of work required.

What Is A Wall Air Conditioner?

A through-the-wall air conditioning unit is basically a window-mounted air conditioner.

It has a compressor and condenser coil inside the room where it’s installed.

It uses a fan to pull cool outside air into the room and push warm air out of the room.

It’s usually placed in the attic or basement of your home.

Why Should You Get Through The Wall Air Conditioner?

Through the wall air conditioners have several advantages over other types of air conditioning units, and some of the main benefits include:

  • They Are More Efficient Than Central Air Conditioning Systems

Central air conditioning systems use ductwork to distribute conditioned air throughout the entire house.

This means that the air must be moved through long distances before it reaches the rooms where people actually spend time.

This results in lower efficiency and higher utility bills.

Through the wall cooling systems don’t need large amounts of ductwork.

Instead, they use fans to move the air directly from outdoors to the rooms where people spend most of their time.

This makes them more efficient than central air conditioning systems.

  • They Save Space And Increase Energy Efficiency

If you want to keep your living area comfortable without having to open windows, then installing a through-the-wall air conditioning might just be what you need.

These systems are great because they allow you to enjoy the fresh air while keeping your home cooler.

  • They Can Be Installed In Homes With Few Or No Obstructions

Many homes with through-the-wall air conditioning systems have few or no obstructions, and this means that you won’t have to worry about running cables or pipes across ceilings or floors.

You can even get these systems if you live in a multi-story building.

  • You Don’t Have To Pay For Duct Work

Ductwork is one of the biggest expenses when it comes to installing an air conditioning system, but it is a cost you can avoid when you buy a through-the-wall air cooling system.

Instead, all you have to do is purchase a window mount air conditioner and connect it to a vent pipe.

  • They Are Easy To Install

Installing a through-the-wall air-con system is easy.

All you need is a professional contractor who knows how to install these kinds of systems, and you can enjoy a comfortable, cool space in no time.

  • They Offer A Long-Term Solution

Unlike central air conditioning systems, which only last for a couple of years, through-the-wall air conditioning units offer a long-term solution.

They also come with warranties, so you know they’ll always be there for you when you need them.

  • They Can Double As A Heater

Another advantage of through-the-wall air conditioning is that it can double as a heater.

This means that you can turn on the air conditioner during cold weather, and the heat will still work.

When it gets warmer, you can turn off the air conditioner and the heat will still function.

  • They Are Quiet

One of the best things about through the wall air conditioning system is that they are extremely quiet.

They run at low speeds, and they make little noise when they operate.

This means that you won’t wake anyone up when you turn on the unit.

  • They Are Cost-Effective

One of the reasons why many homeowners choose through-the-wall air conditioning over central air conditioning is that they are much cheaper.

A through-the-wall air conditioning costs around $1,000-$2,500, whereas a central air conditioning system can cost anywhere from $5,000-$10,000.

The savings add up quickly, and you can save thousands of dollars by choosing a through-the-wall air conditioner instead of a central air conditioning system.

  • They Aren’t Expensive To Maintain

While central air conditioning systems require regular maintenance, through the wall air conditioners don’t.

All you have to do is clean out the vents once every year.

How To Install A Through The Wall Air Conditioner

How To Install A Through The Wall Air Conditioner

Installing a through-the-wall air conditioner is a fairly straightforward process, and there are just a few simple steps to follow.

These are some of the most important steps you should take before starting your installation.

  • Choose Your Window Mount Air Conditioner

Before you start any kind of home improvement project, you first need to decide what type of window mount air conditioner you want to use.

There are two main types of window mount air conditioners available today: split ACs and ductless mini-splits.

Split ACs are small, portable units that fit inside your windows.

Split ACs are great because they allow you to control the temperature throughout your entire house without having to worry about running wires or making holes in walls.

However, if you live in an area where temperatures get really hot, you may not like this option.

Ductless mini-splits are larger than split ACs, but they aren’t quite as big as traditional central air conditioning units.

Mini-splits are perfect for homes with limited space, such as apartments.

Mini-splits are also more expensive than split ACs, so if you live in an apartment, you might want to consider one of these options.

After you have decided which type of window mount air conditioning you want to install, you need to measure out your room.

You can do this using a tape measure, but you can also use a laser level.

  • Measure Out Your Room

Once you’ve decided which type of window mount air conditioning you want to install, measure out your room and find a spot for the unit.

You’ll need to place the unit somewhere near the center of the room, so it will be able to cool down the whole room evenly.

If you plan on installing a mini-split, you’ll need to position the unit near the ceiling.

This way, it will be able to cover all areas of the room, including the floor.

If you want to install a split AC, you’ll only need to put it near the center of the window.

It’s best to avoid placing the unit too close to the window frame, however, since you don’t want to block the view. 

Find an unobstructed spot located between one and five feet above your floor.

You also need to ensure that your chosen wall faces outwards and that your chosen spot is within reach of an electrical outlet.

  • Mark the Wall Studs

Use a pencil to mark the studs on the wall where you plan to install the air conditioner.

This will ensure that you don’t accidentally damage the wall as you work.

Next, use a tape measure to determine how far apart the studs are.

You’ll need to know this information because you’ll need it later when you begin measuring out the space between the studs.

  • Turn Off the Power to the Room

Before installing your AC unit, you will want to turn off the power to the room.

This ensures that no one else accidentally trips over an extension cord or trip breaker.

  • Install The Unit

Now that you know exactly where you want to place the unit, it’s time to begin installing it.

First, remove the old window from its frame. If you’re working with a split AC, you won’t need to remove anything other than the glass pane.

Next, cut the hole for the unit. Use a drill and a jigsaw to make the hole. Don’t forget to wear safety goggles when cutting!

Next, slide the unit into the opening you made.

Make sure that the unit is placed correctly; then, attach the mounting brackets to the back side of the unit.

The next step is to connect the unit to the power source.

For most window mount air conditioners, this means connecting them to a standard 120V circuit.

Most split ACs come equipped with their own wiring, though, so you won’t have to run any 

additional cables.

Connecting the unit to the power supply should be easy enough. Just follow the instructions included with the unit.

  • Attach The Window Mount Air Conditioner To The Frame

When you finish installing the unit, you’ll want to attach it to the window frame.

This process can vary depending on the brand of window mount air conditioning that you choose.

Some models include screws that you can use to secure the unit directly to the window frame, while others require you to purchase special clips or brackets.

To keep things simple, we recommend purchasing the necessary parts before beginning the installation process.

If you decide to go this route, search online for “window mount air conditioner installation tools” and you’ll find plenty of resources that can help you along the way.

After you’ve finished installing the unit, you may notice that there are gaps in the area around the unit.

These gaps are caused by the fact that the unit doesn’t fit perfectly inside the window frame.

In order to fill these gaps, you’ll first need to purchase some caulk.

Then, apply the caulk to the gap using a brush. Once you’ve applied the caulk, let it dry completely.

You can now move on to the final steps.

  • Clean Up After Installing Your New Window Mount Air Conditioner

Before moving on to the final steps, take a moment to clean up the mess that was created during the installation process.

Remove any debris that remains on the ground after you’ve completed the installation.

Once you’ve cleaned everything up, you’ll need to return the window to its original position.

That’s all there is to it!

Now that you’ve successfully installed your new window mount air conditioning system, you’ll be able to enjoy cool air throughout your home without having to worry about the heat.

Potential Downsides Of Through The Wall Air Conditioners

There are several potential downsides associated with through-the-wall air conditioners, and it is important to be aware of these.

Here are just a few points to consider:

  • Slightly Reduced Capacity

They don’t provide as much cooling capacity as central air conditioners.

This isn’t necessarily a bad thing, but if you’re looking for maximum comfort, you might consider investing in an HVAC system that offers more cooling capacity.

  • Requirement For Insulation

They also need to be insulated correctly, which requires extra work.

Remember that in order to install a through-the-wall air conditioner, you will need to cut a hole in your wall – and this will lead through to the outside of your home. 

If this is insulated incorrectly or inadequately, then you are likely to feel a draft, rain, moisture, and the risk of pests and insects entering your home.

  • Tricky To Move

In addition, this requirement for a hole in the wall means that it can be very tricky to move your through the wall air conditioner if you need to – you will need to cut a fresh hole, and ensure that this is insulated properly.

Final Thoughts

Adding a through-the-wall air conditioner to your home is a great way to ensure that your space is comfortable, cool, and relaxing – but it is important to ensure that you follow our top tips and suggestions to ensure that your installation runs as smoothly as possible every time.

author avatar
Anthony Barnes
Anthony Barnes is the founder of Water Heater Hub and a second-generation plumber by profession. Before developing Water Heater Hub, Anthony Barnes was a full-time plumber, and he has undertaken a wide variety of projects over the decades. As a second-generation plumber, it was easy for Anthony to get used to the technicalities of all from a tender age


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