Muppet said "it depends on the type of AC unit you have.
If it is a central air unit that runs via a furnace then it is not an issue as there is not outside air exchange.
If you have HRV which should technically be off during the summer it exchanges air from outside to inside, even a wall unit ac for the most part takes air from in the room cools it and blows out hot air. "
Mine are window and portable but I wasnt going to stay up all night waiting for an update, so I chanced it!