HELP!! Please. Garage temps to high

Hey everybody, I have a place to grow in a house of a friend. The garage. I live in central FL and it gets kind hot in the garage. I need a solution for the temps. Like air conditioning for a grow box. I dont think he would like it if i cut holes to acces the ac in the house either. so thats not an option. I was wondering if there is some kooky way i can use a fridge or something to get cold air in the grow box??

i grow in my attic, and i live in the southern US as well, it gets to be like 130 degrees up there in the summer. so what i did was instead of cutting a new whole in the a/c to put a line into the cab i just disconnected the line from one of my bathrooms and connected that to the cab.

I thought of that, but he wont let me. I need like to use an air con or something

Anyone have any ideas?