Mount the aluminum frame of the window to the interior side of your window.
How to insulate around doors and windows.
Foam insulation boards which can be purchased for cheap at any local hardware store are great for this purpose.
Then fill in the gaps in insulation with foam which will seal around the window.
Apply rigid foam insulation and foil.
Do not use one that has bleach in it.
Install window insulation panels.
Weatherstrips are an inexpensive way to help seal drafty doors and windows.
This guide from lowes can help you knock out.
Another solution to dealing with a drafty air conditioner is to replace your wall or window unit with an hvac system.
In an entry with a glass door try hanging a floor length velvet curtain directly behind the door pulled to the side during the day it would be a dramatic decorative accent and at night when pulled shut it would provide an extra layer of warmth between the glass and the great outdoors.
Expanding foam insulation works best around doors.
Typically there is little room for insulation between the doorjamb and frame much too little room for typical fiberglass insulation.
Each frame has weatherstripping around the perimeter and that weatherstripping should seal the existing window.
Simply cut the boards to size and fit them in place.
8 diy ways to draft proof the doors windows in your home.
Foams made of hfc or propane propellants are excellent choices.
With the insulation on the inside of the 2 bys right moisture from inside air can condense on cool 2 bys if the insulation isn t sealed properly possibly leading to rot.