You could install a portable ac unit and put the vent across the window.
Install ac in awning window.
Adjust the ac unit s window vent panel to extend across the width of the opening.
Close the window sash against the left side of the a c.
Mounting a standard air conditioner in a sliding window from the inside without a bracket.
Before installing a window ac open the window as far as it goes remove the screen and clean the windowsill glass and window frame.
You re going to need something to flush the vent with the gap of the window so i would recommend foam board cheap or plywood still relatively cheap.
Cut foam weather stripping to length and attach to the window sash and frame.
This would also work if you want to install an air conditioner in a sliding window as well.
Lower the window sash until it rests on top of the vent panel.
You can see how one homeowner did it in the video below.
Many people have inexpensive air conditioners that are intended to fit into a double hung vertically sliding sash windows and want to use them in horizontally sliding windows.
I certainly do not want to go with a portable ac as they re useless and i have tried those already.
How to install a standard a c unit into an unconventional sized window.
Although most portable air conditioners come with a traditional window kit you can absolutely fabricate an insert to fit into the casement window allowing you to vent your portable air conditioner.
First measure the window in order to know what size plexiglas insert.
If you already have some of these air conditioners or are attracted to.
What would be the best way to alter the frame to support a window ac.
Be very careful as the a c is prone to slipping off at this point.
With a partner lift the a c and slowly push it through the window opening and onto the platform assembly.
The window i want to place a window ac is a single pane large awning window that winds out.
Two person operation recommended.
Foam or plywood window insert this method uses the window vent insert that comes with the portable air conditioner coupled with a piece of rigid foam or plywood to block the rest of the window.
Step by step instruction.
Make sure the sash is behind the metal bracket that is attached to the side of the unit.
However any type of material that will keep the hot air out and the cold air in will work.
Measure the width of the windowsill and use a pencil to mark.