Having ventilation issues

So I recently started my first indoor grow and things are going pretty good but I am having a problem with heat. My set up is an 8x8x6 shed with 2 small ventilation holes about 6"x6". I have placed small desk fans in front of them, one facing in and one facing out. I am trying this all on a shoe string budget so I cant really afford a portable AC unit. The Temp outdoors rarely gets above 90 but at times I have seen my thermometer around 95 in the shed. Is there any way I can get better ventilation without buying a huge system?

A little more info for ya. On my veg side i have 2 100w equivalent cfls and 2 t12 40w. On my flower side I am running 1 500w hps. I am still a newb to this so if my set up is all jacked up please let me know