Measure the window and AC unit to confirm a proper fit
Gather the mounting hardware, brackets, screws, and weatherstripping
Choose a window near a grounded electrical outlet
Clear the window area and remove any screens or obstacles
Open the window fully
Place the mounting bracket or support frame if required
Lift the AC unit into the window opening
Center the unit so it sits level and secure
Lower the window sash onto the top of the unit
Attach side panels and extend them to fill the gaps
Secure the side panels to the window frame
Fasten the unit according to the manufacturer’s instructions
Install any additional support brackets if needed
Seal gaps with foam or weatherstripping
Check that the unit is tilted slightly outward for drainage
Plug the unit directly into the outlet
Test the AC unit to confirm proper operation
Lock the window if possible for added security