this would be the worst time to do it, since you are just starting flowering phase... it'll greatly impact yield if you don't give enough light...
now, if the heat is so bad it causes real problems, this may push back a break-even point... i'd wait and see it happen first in this context.
anythign you can do during light hours? leave tent partially open at bottom might help. get AC for that room being the best option, but i understand that may not be one.