I prolly wouldnt have noticed if it wern't in the post to be honest

Oh btw I dont know if your in an apartment or your own house (well assuming your parents house in that case) but you could actually fit bathroom fans in the room where the cockatiel is (a lot cheaper than running the AC 24/7) to suck in air from outside, couse I would easily assume that the outside temp in the shade is definitly safe and considering they doesnt go extinct when the outside temp peaks. one way to avoid having to cut holes in the wall is to make a wooden box you can place infront of the window and then have the window open, and then place fans etc in that wooden box, this would assume you live in such a way leaving a window open would be safe, while it can be made safe for the birds it migth be harder to make it safe from burglers.
EDIT: normally a bathroom fan sucks the air out so make sure it is one that you can either flip the fan or change rotation (or mount on the outside). we have this sollution into the room where we keep the saddles etcetera, where we use the heat from the workshop and circulates it through this room by having one fan in one end of the room sucking air from the workshop into the saddleroom, and another in the other end of the room sucking air from the saddleroom into the workshop. this allows us to have a constant flow of air in the saddleroom couse otherwise it gets kind of a weird smell from all the leather etcetera, and to have the temp pretty much identical to the temp in the workshop.... (long edit I know)