Need Advice On Grow AREA

Ok so i just moved my plants from the attic due to wayyy above average temps..
Now im in a jam because i dont have an enclosed space not being used down stairs..
any advice on what i can do?
maybe put them in a corner?
i have mylar...
and idk where id hang my light as well....
HELP

How big are the plants...?

How many plants are we talkin? Could always build a nice 4x4 tent w black/white poly... cheap,quick and can custom fit to area you need.