i've got a 2x3 area in my closet that im using to grow and im using a 400w HPS. The temperatures in there sometimes gets to 90 degrees with the door open and the window and the fan on all the way. Just wondering what I should do
Then try getting an exhaust fan in there as well. However, if the inside of your apartment gets to 90 degrees then you will just be exhausting hot air to more hot air.