Can window AC be installed on Aluminium window?

Installing a window air conditioner on an aluminum window is possible, but there are some important factors to consider first. Aluminum windows have become increasingly popular in recent years due to their durability, low maintenance, and sleek appearance. However, their thinner frames can present some challenges when installing a window unit. In this article, we’ll look at whether window ACs can be installed on aluminum windows, what you need to know, and some best practices for ensuring a secure, long-lasting installation.

Quick Answer

Yes, you can install a window air conditioner on an aluminum window frame, but you need to take some special considerations into account compared to installing on wood or vinyl windows. The main factors are ensuring the aluminum frame can structurally support the weight of the AC unit, creating a tight seal around the AC to prevent air and water leaks, and securely attaching the installation brackets or slider kit to the thinner aluminum frame. Overall, installing on aluminum windows is possible with the right preparation and materials.

Can You Put a Window AC Unit in an Aluminium Window?

Aluminum window frames are generally strong enough to support a window AC unit, which typically weighs between 50-100 pounds. However, aluminum is not as dense or rigid as wood, vinyl, or other heavier materials. As a result, you need to take steps to reinforce the frame and distribute the unit’s weight properly. Most importantly, you should make sure to install the AC in a part of the frame that has structural supports. Avoid any weaker or unsupported areas of the frame.

You’ll also need to use heavy duty installation brackets designed for aluminum windows. On wood windows, you can often get away with basic friction-fit slider kits. But aluminum requires reinforced brackets that bolt firmly into the frame. They help distribute the load more evenly across the frame. Finally, make sure the aluminum frame is in good condition without any cracks, damage or visible bowing, which could indicate it can’t support the additional weight.

Challenges of Installing Window AC on Aluminium Windows

While it’s certainly possible to install a window AC unit on an aluminum frame, there are some unique challenges to keep in mind:

• Thinner frame depth – Aluminum frames are typically much thinner than wood or plastic, so you have less material to work with for securing brackets.
• Lightweight material – The lighter aluminum can flex more under heavy loads. Proper reinforcement is key.
• Deformation risk – If not installed correctly, the AC unit’s weight and vibration can deform or bend the aluminum frame over time.
• Conduction – Aluminum readily conducts and loses heat, reducing the AC’s efficiency.
• Outdoor use risks – Aluminum windows are often used in seaside or oceanside homes, where salt air can corrode the surface.

However, as long as you address these potential issues through proper installation techniques and maintenance, an aluminum window frame can reliably support a window AC unit.

Tips for Installing Window AC on Aluminium Frame

Here are some best practices to follow when installing a window air conditioner on an aluminum window:

1. Get the Right Brackets

Do not attempt to use flimsy, friction-based slider kits meant for wood windows. Only use heavy duty aluminium brackets designed specifically to handle the weight of ACs on thin frames. They will bolt securely into the frame.

2. Reinforce the Frame

In some cases, you may need to reinforce the frame before installation, particularly if it is showing any signs of weakness or flexing. Adding an angled aluminum bracket on the underside can help shore it up.

3. Seal Air Gaps

Aluminum frames are prone to air and water leaks. Seal any gaps between the AC brackets and frame with weatherstripping tape or caulk. Make sure the seal around the AC unit itself is tight.

4. Insulate the AC

Since aluminum readily conducts heat, wrap insulation around the sides and back of the AC unit. This will force it to cool your room more efficiently. Foam insulation sheets work well for this.

5. Maintain the Frame

Check the frame periodically for any loosening of the brackets or damage from weather elements. Re-caulk or touch up paint as needed. Keep the aluminum clean and dry.

6. Support from Below

For heavy AC units, place a reinforced support bracket or block under the window frame ends to bear some of the weight from below.

What Kind of Bracket is Needed?

To securely install a window AC unit on an aluminum window frame, you need heavy duty aluminum brackets designed specifically for the task. Here are the key features to look for:

• Steel bolts – For maximum strength anchoring into the aluminum frame.
• Thick aluminum – At least 1/8″ thick aluminum avoids flexing under the weight.
• Wide flanges – Maximum surface contact to distribute weight across the frame.
• Angles – L-brackets provide optimal corner bracing.
• Corrosion-resistant – Powder coated or anodized aluminum resists weather effects.

Some top aluminum AC bracket brands include Emerson, Friedrich, LG, Whirlpool, and Sears. You can consult with your AC manufacturer to find the right matching bracket for that unit.

How to Attach Brackets to Aluminium Window Frame?

Follow these steps to properly attach heavy duty brackets when installing a window AC unit on an aluminum frame:

1. Measure and mark out locations for the brackets on the frame, normally spaced at least 24 inches apart.
2. Drill holes for the bracket bolts using a bit suited for metal drilling.
3. If needed, apply caulk or weatherstripping tape into the bolt holes and around bracket flanges.
4. Insert bolts through the bracket and thread them into the aluminum frame holes. Tighten securely.
5. Test that the brackets are firmly anchored by applying pressure. They should not shift or rock.
6. Carefully lift and mount the AC into the brackets following the manufacturer instructions.
7. Ensure a tight seal with insulation, caulk or weatherstripping as needed.

Periodically check all bolts and brackets to make sure they remain securely tightened on the frame.

How to Seal a Window AC in an Aluminium Window?

Proper sealing is critical when installing a window AC unit in an aluminum frame to prevent air leaks, water intrusion, and lost energy efficiency. Here are some sealing tips:

• Caulk – Apply waterproof silicone caulk generously around the AC brackets and frame contact points.
• Weatherstripping – Adhesive-backed foam or rubber strips help seal gaps.
• Insulation – Wrap insulation around AC unit sides and back that contact the frame.
• Plexiglass – Cut custom pieces to seal open gaps around the AC in the frame.
• Sealant tape – Specialized metal tape sticks to the AC and frame to seal gaps.
• Gaskets – Self-adhesive rubber gaskets seal the moving parts of slider kits.

Ideally, use a combination of caulk, weatherstripping and insulation or tape to create airtight, watertight seals around the full AC unit perimeter.

Conclusion

Installing a window air conditioner in an aluminum frame is certainly possible, but it’s not quite as straightforward as installing in wood or vinyl. The thin, lightweight aluminum requires some special considerations. Strong, reinforced brackets, generous weatherproof sealing, and potentially some supplemental bracing of the frame are needed for a secure, long-lasting installation. But as long as you follow the proper techniques and use heavy duty aluminum-specific brackets, an aluminum window can reliably and effectively support a window AC unit. Just be sure to do the prep work and take the structural needs into account.