Are you looking for a contractor?

Submit our quick form and get quotes now!

Table of Contents

Installing a Wall-Mounted Air Conditioner

Installing a Wall-Mounted Air Conditioner

Exterior renovationsInstalling a Wall-Mounted Air Conditioner

As the summer months slowly approach, we must begin to think about preparing for warmer weather. In Canada, temperatures can soar during summer months, leaving us hot and bothered. Luckily, installing an air conditioner in any home is a great way to keep cool when things outside are hot, hot, hot!

However, not everyone has the space to accommodate an internal air conditioner or a sturdy window to accommodate a window unit. Well, homeowners facing either of these problems can always consider a wall-mounted air conditioner. With our quick and easy installation guide, taking on this DIY project shouldn’t be a problem.

NOTE: It is best to hire experts who are used to carrying out this type of installation and working with the tools that will be used throughout the process. These instructions are only meant to give you an idea of the steps involved. 

Couple in living room with wall mounted air conditioner

Here is how to install a wall-mounted air conditioner!

Gather Materials and Products you Will Need

To complete this installation job, you'll want to be properly prepared with all of the correct tools and materials. This means that you should make sure to have the following:

  • stud finder

  • level

  • pencil

  • reciprocating saw

  • drill

  • hammer

  • drywall saw or Exacto knife

  • as well as a 1" drill bit.

Other handy things to keep around are a vacuum or broom for dust that will arise during the process, as well as rubber gloves and protective eyewear for obvious safety reasons. 

First Step: Choose Where you Will Install the Wall-Mounted Air Conditioner

First things first, choose a spot for your unit. Don't place it anywhere close to electronic or electrical devices, as on particularly humid days there is a potential for discharge to leak and damage these items. Plan for the bottom of the unit to be 30 to 150 cm from the floor, as this will help to minimize dust from clogging the air conditioner's filter, as well as condensation forming on the ceiling of your home.

Further, determine how thick your wall is, from the inside to outside, by measuring it. This will help you to know what type and size of the air conditioning unit you should purchase. Complete these steps before buying your unit to make the installation process that much smoother!

Start installing the appliance

Now, to start the installation process. First, you'll need to pick a spot for the unit to go. Locate the studs in your walls by using a stud finder. If you don’t have a stud finder, it’s a straightforward process to locate the studs by rapping on the walls with your knuckles and waiting for the sound to turn from hollow to solid as you rap over a stud. Make sure to mark the placement of the studs on the wall using a pencil.

Using a level, draw a line for the top edge of where you intend to cut a wall opening for your unit. Follow that with 3 other lines to complete a rectangle the size of the unit. Indicate the layout of the air conditioner in relation to the studs on the wall, trying to minimize the number of studs that will need to be removed.

Remove the gypsum

Next, remove the moulding that surrounds the intended opening for your AC unit, as well as the drywall from the area between the studs. This can be done by repeatedly scoring the wall with a razor blade or utility knife, marking along the inside of the studs. It is not necessary to completely penetrate through the drywall, as a sharp hit will break it from its place.

You can also use a drywall saw to complete this part of the project. Make sure to keep a vacuum close by to eliminate any dust build up during the process. Following this, use a hammer, or if you’re up for it, a gloved fist, to knock out enough drywall to find wires or other obstructions that may be hiding.

The next step is to carefully remove the insulation from the inside of the wall, and save this piece for future use. Grab that level and pencil and begin marking a rectangle on the now exposed exterior siding to mimic the size of the drywall opening. You're going to be cutting out an opening in your exterior siding, so using a drill, pierce a hole inside of the rectangle, making sure it is big enough to insert the blade of that reciprocating saw we mentioned earlier.

Using said saw, cut out the marked rectangle in the exterior siding to finish opening up the wall. Make sure the opening is big enough for your air conditioner to slide neatly in place, and not so big that it falls directly onto the street! Measurement is key here, so pay close attention.

Insert the Wall-Mounted Air Conditioner and Stay Cool!

Télécommande climatiseur

Now, you'll want to make a frame to support your air conditioning unit.  Create a rectangular frame out of a 2" X 4". This frame will need to be the exact size, and fit snuggly into the wall opening. Secure the frame into the studs hidden inside of the wall by hammering nails through it and into the studs.  Now the wall is prepped and ready to hold your air conditioner! On your unit, locate the metal-plastic flanges that will have screw holes.

Once the air conditioner is in place, use your drill to insert screws into the flange hole, securing the AC in place. Next, incorporate the saved insulation into the spaces between the unit and the wall. Following this, close the opening up with drywall, and voila! You'll be sure to keep this room cool with your wall mounted air conditioner unit.

One last note: these instructions offer general steps. It is possible that the model you purchase will have extra steps or an installation process that is somewhat different. Always refer to the instruction manual that is provided with your appliance. 

Get 3 renovation quotes for your wall mounted air conditioner installation project

RenoQuotes.com can help you get quotes for your air conditioner installation project. If you submit your project to us, we’ll put you in contact with top-rated contractors. Fill in the form on the homepage (it only takes a few minutes), and you will receive quotes from companies that are specialized in home renovations.

Dial 1-844 828-1588 to speak with one of our customer service representatives

Get 3 free quotes for your project!

Submit a project and get 3 free quotes!


Last modified 2023-11-07


Get 3 free quotes for your project!

Submit a project and get 3 free quotes!

Looking for something else?


Table of contents


Get 3 free quotes for your project!

Submit a project and get 3 free quotes!

Are you a contractor?

Join our network and receive real leads!

Download the price guide for renovations

We’ll be emailing you the latest market price guide for renovations.



Related articles

The latest industry news, interviews, technologies, and resources.

7 min read

Amanda Harvey • 12 Feb 2024

How to Restore an Old Balcony

A balcony is a beautiful addition to any home, a portal to the outside world at the touch of your fingertips, and a way to get some fresh air without leaving the house. However, since balconies are stuck outside day and night, they face deterioration and damage caused by various natural elements.

5 min read

Cynthia Pigeon • 07 Nov 2023

8 Ways to Design and Remodel Your Entryway

A home’s entryway rarely is made a priority when it comes to home remodelling and renovations. Usually, when it comes to organizing this space, it is most likely centred around functionality, embellished with a few decorative elements to make the space more inviting as a whole.

4 min read

Karine Dutemple • 07 Nov 2023

10 Ceiling Design Examples

Who said a ceiling has to be dull and boring? If yours lacks style and borders a little too close on the tedious, here are some design ideas that might interest you!

5 min read

Léa Plourde-Archer • 07 Nov 2023

Renovation Contractor: How to Organize During the Peak Season

As a renovation contractor, are you already thinking about the impressive amount of jobs that you will be working on in the peak season? Although this busy workload always represents good news, it can be hard to coordinate!

5 min read

Amanda Harvey • 07 Nov 2023

What is a French Drain?

A French drain works with gravity. Water follows the ebb and flow of the earth's guiding principle, and thus, the drain carries water downstream. This sloped trench provides a method to help homeowners avoid damp patches on their lawn or property by regulating drainage, and keeping things dry in places where it's necessary.


Looking for a contractor?

Submit a project and get 3 free quotes now!