Garage grow room....advice needed pls

Ok...I'm setting up 2 grow stations in my garage. I want to invest in a HPS system but my grow area is rather small...3'wx3'lx4't. My problem is this - I have to do this very covertly and my garage is not climate controlled. I live in NW Florida and if the outside temp is 90 degrees my garage is 90 degrees. I plan on adding a small fan to the unit but will the HPS system cook my plants? The smell is not an issue just the heat. What do you suggest?

portable AC and air cooled lights....

inlet fans.. a couple ocoilation fans oover and on the plants.. exhaust fans help alot.. if heat is an issue keep the fans on all the time.. and test run the setup before you put in the plants.. you don't want them to bake..

Just grow Oct to May, but you still will need air cooled light and a good exhaust fan

I built a room following the coutures of the roof frame.
Enclosed with the foam board with the silver backing. Completely enclosed. space is about 9x9x9. I put an ac ($99.00 at Lowe's made by Samsung . Works great.)
I put the ac on a thermostatic outlet and I set it to hold 87.
In constructing this room I used over 3 rolls of aluminum tape. Then I lined the inside with white/black vynal wall covering from htgs.