Your case will limit your airflow. Hopefully you have a front intake fan. The only thing you can do for your current
situation is install a more powerfull fan in the rear of your case. If you are gamming or running any programs
that put your cpu under maximum stress an aftermarket cpu cooler is necessary. This would be for longer cpu life an keeping temps low while gaming. If your not stressing your cpu your ok.The same goes for your case . It is made for lower air flow and quieter operation.the main thing to worry about this summer is keeping your room as cool as possible.