You probably meant to post this is the Appliance forum rather than the Accessibility forum?
You can read a bit about it at the following link. If you have any specific questions, you could try asking them in the appropriate forum (eg. Appliances, Electrical, Masonry and Stone, etc.).
LINK > Installing an In-Wall Air Conditioner
The Appliance Information Site
hole in wall
wall a/c unit
Stucco Exterior with Cement panel interior underneat...
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