transport traveling

Hey guys um this is my first time posting here, i hope i'm not messing anything up, and i don't really know much about how this works but i've been needing help getting my little one to the vet and i had no one help me in my life! So i need to figure it out! Maybe you can help? Vet is 4 hours...

I will be moving soon into a new apartment and I'm not sure how to transport my bird. I don't have a reliable air conditioner so I can't just let him be out because I need the windows down. It is a long ride and I don't know whether to put him in a small box or a small cage. Would he be better...