How to Mount Brackets for Window Air Conditioners

Written by patrick nelson
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How to Mount Brackets for Window Air Conditioners
(window air conditioner image by Aaron Kohr from

All the supporting parts and brackets for a window-mounted air conditioner must be secured to firm wood, masonry or metal to stop the air conditioner falling out of the window and hitting a passer-by on the head. Air conditioner manufacturers sell kits specifically for mounting air conditioners in windows. Considerations also include tilting the air conditioner a bit to allow it to drain.

Skill level:
Moderately Easy

Things you need

  • Level
  • Screwdrivers
  • Drill and bit
  • Window mount kit

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  1. 1

    Prepare the air conditioner. Remove the air conditioner from its case by removing the screws from the grille and sliding the air conditioner out. There may be tabs to depress to get the grille off. Attach the top mounting rail strip. Remove the backing and attach it to the top of the air conditioner case with included screws. Install the side accordion panels with screws.

  2. 2

    Prepare the window. Cut the window sash seal to the window width and stick its adhesive side to the bottom of the sash.

  3. 3

    Install the case in the window. Place the case in the centre on the stool and pull the window down. Select a position that puts the sill supports near the outermost part of the sill. Attach the sill supports to the sill and the case so that there is a slight tilt to the outside. You can use a level. Half a bubble will do it.

  4. 4

    Secure the case to the window sill with screws and pull the accordion to fit. Attach with screws.

  5. 5

    Install the support bracket and foam top window gasket. The support bracket attaches to the window side jam with one screw. Cut the gasket and stuff it between the glass and the window.

  6. 6

    Install the air conditioner in the case. Slide it in by the base pan. Replace the two screws removed earlier. Attach the grille. Make sure there's no one below and test the security by giving it all a good shove. It should not move at all.

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