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Window air-conditioners provide a cost-effective alternative to expanding the air-conditioning system in a home or adding a system for a detached room. Installing an air-conditioner in a sliding casement window requires installing a support at the outside wall that stabilizes the outer portion of the unit. For a second-story window, enlist a professional to do the installation. Alternatively, a home-improvement enthusiast with basic skills can install a window air-conditioner at a first floor window with everyday tools and the help of an assistant.

Setting Up

1

Open the sliding panel. Remove the trim insert that borders the lower portion of the sliding panel. For a vinyl casement window, pry up the insert with a putty knife. For a wood casement window, carefully pry up the insert with a wood chisel. Save the insert.

2

Position the sliding panel so it's open halfway. Lift up on the edges, and tilt the bottom toward you, then lower the panel and remove it. Set the panel aside.

3

Measure the width of the opening between the outer edge of the stationary panel and the side of the frame where the sliding panel closes. Obtain the air-conditioner based on the width of the opening. Obtain a support kit that includes the necessary fasteners for stucco, masonry or wood and vinyl siding. Obtain an adjustable filler kit.

Support Kit

1

Set up a power or cordless drill with a screw-tip attachment. Position the platform plate from the support kit flat on the bottom of the window frame. Align the inner edge at the inner edge of the window sill with the outer portion of the platform extending outside. Measure the opening from side to side, and center the platform in the opening. Attach it to the sill with a provided screw at each of the machined holes in the edge of the platform.

2

Work from outside of the building. Position the support brace diagonally below the platform. Fit the upper end into the slot near the outer edge of the platform. Fit the inner end against the outside wall, and mark the wall at this point. Set the brace aside.

3

Use the mark on the wall as a guide, and position the steel support track horizontally at the face of the wall with the lower edge at the mark. Visually center the track below the platform. Attach the track to stucco or masonry with one of the provided concrete screws at each machined hole in the track. For wood or vinyl siding, attach it with a provided wood screw at each hole.

4

Fit the upper end of the support brace into the slot at the underside of the platform. Attach the lower end to the track with the provided machine bolt and nut. Tighten the nut with an open-end wrench.

1

Ask an assistant to help lift the air-conditioner. Position the outer end on the platform, and slide the unit toward the outside to fit the lower edge of the face-frame against the edge of the platform at the window sill. Make sure the power cord and plug are inside the room.

2

Center the air-conditioner from side to side in the opening. Secure it in place with one of the provided L-brackets and small self-tapping screws at each side of the air-conditioner case.

3

Measure the width of the open spaces at each side of the air-conditioner case. Measure from the surface of the lower window frame to the top of the case at each side. Use a utility knife to cut pieces of the flexible plastic filler to size. Slide one edge of each filler into the corresponding channel at the side of the case from above, and fit the lower edges of the fillers at the lower frame of the window.

4

Measure the opening from side to side across the upper edge of the case. Cut the provided foam seal to length with the knife. Peel off the paper backing on the seal. Position it across the top of the case, and press the adhesive side against the back of the face frame at the top of the case.

5

Install the accordion filler in the opening above the air-conditioner, Typically, you install an upper track across the upper window frame with the provided screws and the side tracks at the corresponding sides of the opening. If necessary, refer to the instructions to install the filler.

6

Plug in the power cord for the air-conditioner at a nearby electrical outlet. Refer to the owner's manual for the settings and functions, such as a programmable timer.

Things You Will Need

• Putty knife
• Wood chisel
• Measuring tape
• Power or cordless drill
• Screw-tip attachment
• Open-end wrench
• Utility knife
• Cardboard
• Hacksaw or handsaw

Tip

• To determine the necessary capacity and output of a window air-conditioner, multiply the length of the room by the width, and multiply the result by the height of the ceiling. Divide the result by 9 to determine the cubic-footage of the room.

Warning

• Do not use an extension cord connected to the power cord for the air-conditioner, or you risk damaging the unit and overloading an electrical circuit. If necessary, enlist an electrician to install an outlet in proximity to the window and air-conditioner.

About the Author

William Machin began work in construction at the age of 15, while still in high school. In 35 years, he's gained expertise in all phases of residential construction, retrofit and remodeling. His hobbies include horses, motorcycles, road racing and sport fishing. He studied architecture at Taft Junior College.

Photo Credits

• Jupiterimages/Photos.com/Getty Images

The installation of an air conditioner for a casement window is similar to installing one for a double hung window. However, there are specific steps that are unique to this type of air conditioner. Because of the shape of the window, these units are also called vertical window air conditioners and are taller than the typical window air conditioners. In this article, we will discuss how to install an air conditioner window unit for a casement window or a sliding window.

How to Install a Casement Window Air Conditioner

The instructions below are for a typical slide-by window made of wood or a metal casement window. You may need to make modifications if installing in a different type of window other than the ones referred to here. Also, be aware of your city or state’s codes for electricity. Keep in mind that you may need a professional electrician to determine if you have the proper grounding for the air conditioner.

Casement Window Air Conditioner

Preparing for Installation

If installing on a wood-frame casement window, there may be a need to build a wood frame using at least 1-inch (2.54 cm) thick wood, with a 15-1/2-inch (39.37 cm) wide opening. For mounting purposes, if the material is brick or cement, it may be necessary to put a wood stool strip under the air conditioner.

Tools Required

Fine tooth saw

Knife and scissors

Pencil

Because the unit weights between 88 (39.92 kg) to 105 (47.63 kg) pounds, it is recommended that you have someone help you with the installation. Also, be sure to inspect the condition of the window to ensure that it can hold the weight of the unit.

When selecting a location for the air conditioner, keep in mind that corners do not allow air to flow properly, so a centralized location is recommended. Typically, the casement window must be at most 16 ¼ inches wide (41.27 cm) and at least 21 ¼ in in height (53.97 cm) with a maximum height of 39 7/16 in. (100.2 cm). Please refer to your owner’s manual for specific dimensions for your unit. Also, the window must be within 6 ft (1.83 m) of an electrical outlet. You should not use an extension chord.

After selecting the window for the unit, you will need to find the proper location for the support base.

When installing an air conditioner in a sliding casement window, you also have to install a support bracket on the outside wall that braces the outer part of the unit. To prevent damage to the outside wall, you may want to use a siding protection board, which needs to be long enough to span 2 wall studs.

The following steps will explain how to install the air conditioner on the slide-by window:

1. Attach the support brace platform. There should be a 45° angle between the support brace and the platform. There should also be a slope of 3/16 of an inch (0.4762 cm) on the platform to allow for proper condensation drainage.

2. Measure and mark a line 8-11/16 in from the window jam. This will be used as a marker for the support platform.

3. Install the support platform assembly. You will drill holes in the window frame that correspond to the holes in the platform. Refer to owner’s manual for specifics.

4. Your unit should include a track seal that is placed on the room side of the window track. Install the track seal. If installed correctly, the two holes drilled in step 3 should be directly the seal strip in the inner track.

5. If using a siding-protection board, install to the side of the outer wall of the home.

6. With platform tab against the inside of the window track, attach the support platform assembly to the window jam.

7. Adjust the platform so that the outside edge is 3/16 inch (0.4762 cm) lower that the inside edge.

8. Level the platform so that it is balanced from side to side.

9. Measure the height of the window opening and subtract the height of your AC Unit. This will be used to cut the window frame included with the unit.

10. If your unit includes an additional decorative frame, cut to specified height measured in step 9.

11. Attach support side panels to AC unit using included screws.

12. If your unit includes a plastic window panel, cut to match the plastic window frame prepared in step 10.Link state power management freeze.

13. Slide plastic window panel into window frame with smooth side facing the interior of the room.

14. Attach the window panel and frame to the air conditioner. Add any weather stripping included to the side of the AC and plastic frame.

15. Remove the front assembly of the unit. Take care not to push or pull the direction louvers.

16. Now, place the casement air conditioner in the window opening. It should fit into the window opening so that the side channels and window panel frame are against the side and top window jams.

17. Slide the window sash against the side of the air conditioner. It should fit snugly against the AC. If it does not, you many need to use screws to attach the panel frames to the sash. (Refer to your owner’s manual).

18. To secure the unit, attach the safety bracket over the base of the air conditioner and attach to the from of the support platform. This will prevent the unit from moving.

19. Insert the foam seal strip/sash between the window glass and the vertical sash.

20. Install the locking bracket to the inner window sash to the base of the outer window sash.

21. Replace the front cover. Again, take care not to push or pull the front panel louvers.

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The above instructions can be adjusted based on the size of your window. Please refer to your owner’s manual for specific details regarding your unit.