how big is the room you have your plant in? if its a closet, use that window fan you have there to blow in with one side, and suck out with the other, and place it higher in the room, right in the door.
if its a big room, like a bedroom, put the fan in a window, and use the fan to do the same (but this is even better)
at 85 degrees you need to get that temp down and the humidity as well. Ventilate the area. my growspace is real small, and ventilated to outside air with 1 small 12 volt PC case fan blowing out, up high to vent the heat, and one sucking in down low to draw in cool air.
my room maintains a fairly constant 80 degrees daytime, and 70 degrees nighttime and despite being a garden shed in the california sun.