If you are worried about the stability and safety is number one use angle brackets.
How to put an ac in a sliding window.
All that is n.
A c installation types if your window slides from side to side a slider casement air conditioner fits the bill for you.
In the 3 8 c channel insert nut rod coupling on the end.
Lay a shorter piece of 2x4 down and screw the ends of the longer pieces to the ends of this shorter one as shown.
The last step is to install a window air conditioner in a sliding window or door.
Most in window air conditioners are meant to fit inside vertically sliding windows only meaning those with larger horizontally sliding windows in their house are left out.
Because of the depth of the lumber i used deck screws 2 at each connection point.
Install the frame into the open window.
Create a rectangle by screwing another short piece of 2x4 between the long pieces at the other end as shown.
Fasten the machine by using one or two screws into the lips.
Cut two pieces of the c channel in both sizes1 2 and 3 8.
Drill hole on the side through channel and coupling than insert a screw.
Measure your a c from left to right including your frame.
Edit may 7th 2018 when i did this video it was intended as a private view only for my brother in law.
This is a very simple inexpensive and easy way to install an air conditioner in a slider window without buying an a c made for slider windows.