The AC installation steps are as below:   Step 1: Determine the exact location of your window's center. Step 2: Attach the weatherstrip if one is provided. Step 3: Assemble the Side Panels Step 4: Insert the air conditioner into the window. step 5: Attach the L Brackets Step 6:Extend and connect the side panels in step six. Step 7: Secure the unit and begin the cooling process.