Need advice on placement of fan

[Adsthebest]

Hello,
Recently my Pc has been heating up , while gaming so I decided to install a fan but my case is a small one and does not allow front intake.
My psu is mounted on the top.
The gpu at the bottom ( It takes air in).
Hdd at the front.
My temp while gaming-
Cpu - 50-55 degrees ( depends on game)
Gpu - 60-82 degrees ( depends on game)
Hdd- 48-53 degrees ( depends on type of game).
Specs
Cpu - i3 4130
Gpu- Msi gtx 1050 2 gb OC edition (single fan)
Hdd- Toshiba 1 tb
Ram - 2 x 4 Gb 1600 MHz
PSU - 500 watt
Motherboard - Asus h81-Cs
Idle temperatures are fine , only heats up while gaming

 

[smorizio]

take the side panel off if the rig runs cooler think about using a dremal or have someone cut a whole on the panel for 120mm or larger fan.

 

[SkyNetRising]

My temp while gaming-
Cpu - 50-55 degrees ( depends on game)
Gpu - 60-82 degrees ( depends on game)
Hdd- 48-53 degrees ( depends on type of game).

Those temperatures are on the warm side (especially HDD). Your system would definitely benefit from better airflow.
What's the case model name?
May be it's time to upgrade to larger/ better cooled case?