How to Install an AC in a Double Hung Window
Installing a window air conditioner in a double-hung window is a relatively easy task. A double-hung window has two sashes, a lower and an upper, that can both be opened. By sliding the lower sash up you can accommodate a window air-conditioning unit. Does this Spark an idea?
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Things You'll Need
- Air conditioner
- Screwdriver
- Screws
- Tape measure
- Drill
- Small drill bit
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Instructions
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1
Choose the window that you want to install the air conditioning unit in. Ideally, a wall outlet will be in close proximity. Measure the window with a tape measure to ensure that the air conditioning unit will fit properly. Measure the width and the height of the open area with the bottom sash raised.
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2
Install the support bracket for larger units on the outside of the window to support the weight of the portion of the air conditioner that extends out of the window. The bracket rests on the window frame, secured with screws into the side of the house. This bracket, not required for smaller units, will be included with your air conditioner if necessary.
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3
Open the lower sash completely and place the air conditioner into the window. Lower the bottom sash so that it rests on top of the unit and holds it in place.
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4
Extend the accordion panels on the sides of the unit so that they reach the sides of the window frame. Drive the supplied screws into the sash frame or window frame to secure the panels in place. Drill small pilot holes in the screw locations to make this task easier.
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Install a piece of weather stripping between the lower and upper window sashes. Because the lower sash remains open, a gap will be present between the sashes that will allow cold air out and hot air in if not filled.
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Tips & Warnings
For units without an outside support bracket, install angle brackets above the top of the lower sash. This will secure the sash on the top of the unit and keep the weight of the unit from pushing the sash open.
With wood windows, you can later fill screw holes with wood putty, should you no longer require the window air conditioner. With vinyl windows, the holes will be slightly more difficult to hide later. Filling the holes with caulk will generally camouflage them sufficiently.
Be mindful when handling the unit as they can be quite heavy and the metal fins on the unit can be sharp and cause cuts. Wear gloves when installing the unit.
