Drilling in drywall, hit copper pipe with high pressure air?
Unless you have a home workshop with an air compressor (and I'm quite sure you don't) you have punctured your air conditioner refrigerant line and drained the system.

The "air" was actually refrigerant. While not toxic it's certainly not healthy and your room now has several pounds of it floating around at floor level. 

You will want to do the following, more-or-less immediately:


remove any pets or children to upper floors or (better) somewhere else.
open windows
ventilate the room / floor. Rent an industrial fan with a large duct, put the fan in the room and the duct leading outside. Any rental place will have one. Tell them what happened or you will probably get a carpet-drying fan. We need to remove air, not move it around.


In the near future, you will be cutting open that part of the wall. Call an air conditioner serviceman with the make and model of your unit and tell him you punctured the line and drained the system. He will fix the line and refill it with new refrigerant. Don't try fixing the pipe yourself - the joint has to be gastight with the proper parts or it will leak again. The parts &amp; labour for fixing the pipe will be less than the sales tax on the refrigerant, and the guy just might do it for no extra charge (sympathy for the $1000+ you're paying for new gas).