How much AC for a sealed C02 room?

Room is apprx. 8' x 20' x 7'5" tall.
I am running 5 1000 adjust-a-wings. I want to run C02 now and need to size a window mount or maybe even a free standing unit.
My ballast are lumateks and they are mounted in the room as well.
At this time my girlfriend and I cant really afford to buy new hoods to run aircooled lights so for now we are stuck with the adjust a wings.
Any help in AC unit recommendations is greatly appreciated.

It s a regular sized room, i would just get a small window ac unit. new ones have a thermostat they run on to keep the temp set easier. Check out garage sales, an good wills for used units.
Also you need to have half ac outside the room to vent the ac heat.