Window AC Installation | Midea Canada

With a few basic tools, a bit of prep, and clear steps, you can set up your AC safely and help it run well all summer. In this guide, we explain window AC installation step by step. We also share simple tips that help you get steady, comfortable airflow once everything is in place. Read on!

What Should You Consider Before a Window AC Installation?

Before installing window AC unit, take a moment to check a few key details. These quick steps help you avoid problems during setup.

• Confirm the window frame size matches the AC unit's dimensions.
• Check whether your window type is compatible, especially if you have a sliding window.
• Determine if you need support brackets, since not all units include them.
• Ensure a properly rated outlet is within reach without relying on extension cords.
• Avoid installing window air conditioner in an egress window or any fire escape route.
• Choose a window with partial shade to help improve cooling efficiency.

How Do You Prepare the Window and AC Unit Properly?

To prepare the window and AC unit properly, ensure both the space and the equipment are ready for a smooth, secure installation.

• Measure the window opening carefully to confirm the unit fits with enough space for proper sealing and support.
• Remove the window screen to provide full access to the frame, then store it safely for future use.
• Keep your workspace clear and organized to avoid tripping hazards during installation.
• Keep tools such as a measuring tape, screwdriver, and scissors within reach for quick access.
• Ask someone to assist you, as window AC units can be heavy and difficult to position safely on your own.

Tools and Materials You'll Need for Installing Window AC Unit

Here are some tools and materials needed to install AC on window:

Tools:

• Drill
• Screwdrivers
• Level
• Tape Measure

Materials:

• Window Unit A/C
• A/C Weatherstripping

How to Install a Window AC Unit Step by Step?

With the window and unit fully prepared, you can now move on to the window AC installation process. The goal is simple: make sure the unit sits safely in the window, stays level, and seals well so cool air stays inside.

Step 1. Mount Window AC

First, put AC in window. Have someone help you lift and start fitting window AC by raising the bottom sash all the way, then center the unit in the opening. Set the AC on the windowsill and keep it steady.

Slide the bottom flange against the outside edge of the sill. Lower the sash onto the top of the AC so the sash holds the unit in place. This creates the basic support most window AC installations rely on.

Step 2. Securing the AC Unit

After the unit is resting on the sill, make sure the top sash doesn’t move. Add two screws through the upper flange of the AC case into the window sash. Drilling small pilot holes first helps prevent the wood from splitting.

Next, add the L-shaped clips that lock the bottom sash to the top sash. If your AC doesn’t come with clips, wood spacers can also keep the sash from shifting.

Step 3. See If Outside Window AC Unit Mounting Brackets Are Necessary

Some AC units are heavy and need an exterior support bracket. This bracket helps hold the weight and keeps the unit steady in the long run. Many brackets can be installed from inside the home. Look over local rules too, since some areas require brackets for all window AC units.

Step 4. Complete the Installation of the Air Conditioner

Pull out the AC’s side panels and extend them to the window frame. These panels block outdoor air, bugs, and moisture. Follow the maker’s instructions to screw or clip them into place. For better cooling, add insulation around the panels. Foam board or accordion-style pieces create a tighter seal.

Step 5. Seal Gaps

Check for small openings between the two window sashes. A foam strip usually comes with the AC, so cut it to the right length and press it into the gap. If you need more, extra foam seals are easy to buy and help keep cool air inside and hot air outside.

Step 6. Plug and Test the Unit

Look over the manual to make sure nothing was missed. Plug the AC into a grounded wall outlet. Set the temperature and fan speed, then let the unit run. Listen for odd sounds and check for air leaks. A steady, smooth airflow means the installation is complete.

How to Choose the Right Window AC Unit

Choosing the right window AC unit starts with matching the unit's cooling capacity and efficiency to your room's needs.

• Determine the correct BTU (British Thermal Unit) rating by measuring your room size:

1. 5,000–7,000 BTUs for 100–250 sq. ft.

2. 7,000–11,000 BTUs for 250–500 sq. ft.

3. 11,500–18,000 BTUs for 500–900 sq. ft.

Selecting the right BTU level ensures the AC cools effectively without wasting energy.

• Check the Energy Efficiency Ratio (EER): A higher EER means better performance with lower energy use, helping reduce electricity costs while minimizing environmental impact.

Maintenance Tips for Window AC Units

Keeping your window AC unit well-maintained helps it run efficiently and last longer. Follow these tips to keep it in good condition:

1. Clean or replace the air filter every 30 to 90 days. If the filter is reusable, wash it with mild soap and warm water, then let it dry fully before putting it back. A clean filter helps the AC cool faster and use less power.

2. Clear dirt from the outer coils. Use a soft brush, compressed air, or a gentle cleaner to remove dust and debris. This is especially helpful if plants or shrubs sit close to the unit, since they can blow dirt onto the coils.

3. Check the weatherstripping. Look for cracks or missing pieces around the window. Replace worn areas, and if the AC stays in year-round, add caulk to seal any small gaps and improve efficiency.

4. Keep the area around the AC clean. Wipe dust from the front vents and remove anything that blocks airflow, such as curtains or furniture. Better airflow helps the AC cool the room more evenly.

5. Run a quick test before summer starts. Turn on the AC for a few minutes to make sure the fan, cooling, and controls work properly. Early checks make it easier to fix small issues before the heat arrives.

Conclusion

A well installed window AC unit can keep your home cool and comfortable through the warm months. When you learn how to install the window air conditioner and take your time fitting the window AC into place, the unit can run safely and reliably. Regular care, such as cleaning the filter, checking the seals, and looking over the coils, helps the AC stay strong and work well for years. For dependable cooling options, explore window AC units from Midea.

FAQs 

How much does window AC installation cost?

Window AC installation typically averages around $313, with most homeowners spending between $138 and $525, depending on the unit's size and quality, labor rates, and whether the setup is temporary or permanent.

A new window AC unit itself can range from about $60 for a small DIY model to $1,200 for a larger system that requires professional installation.

Can I install a window AC unit myself?

Yes, you can install a window AC yourself if you have basic tools and follow the instructions carefully. Most units come with a window air conditioner installation kit that makes the process straightforward.

If the AC is heavy, get someone to help lift and position it. For more complicated setups, such as concrete wall installations, hiring a professional may be necessary.

Do window air conditioners have to be vented outside?

Yes, window air conditioners must be vented outside. All AC units need a way to release the hot air they remove from your home, and venting indoors would send that heat right back into the space, reducing efficiency and increasing energy costs.

Window ACs exhaust heat through the back of the unit, while portable units use a hose, and central systems rely on ductwork to move hot air outdoors.

Is it cheaper to run a window AC unit or central air?

It depends on how much space you need to cool. If you're only cooling one or two rooms, a modern window AC is usually the cheaper option because it uses less energy for small areas.

But if you want to cool the entire home, a well-maintained central air system is generally more efficient and cost-effective than running multiple window units simultaneously.