Are expensive ventillation and temp controls neccesarry for this grow closet?

I have a 7'*5'*8' closet grow room going right now and am wondering if i need ventillation or Drastic temp control measures.
Basically,it is an appartement built-in closet.I have 2 sliding doors.I took down the sliding doors and i stapled white plastic to the top so the plastic covers up the hole and light leaks that could confuse the plants.
I have 2 oscillator fans pointed torward the 400w light and temps don't get above 83F. and thats only on a hot day and i just open the plastic sheeting and raise the Appartement A/C a bit and temps then usually settle at about 77F.

Should i buy an expensive 260CFM fan.attach a door rigged with an 260CFM exhaust?
Or is it the way i have it now good enough?

Oscillating fans work well for keeping your lights cool and keeping your leaves moving.
But what you want is fresh air to come into the room and something to pull the exhausted air out of the room.