temps ikn Antec 1200 hundred

I have an Antec 1200 case with the 6 fans temps for GPU 43c desktop gaming 65c / 68c

Hardrive 25c all the time
GPU fan auto set 40% fan speed nevr seems to go up.
Q6600 cpu cores *4 highest 36c all loads

Dont know what the over case temp is ie the whole space.. Is there a way to find out?

Is it worth the side window fan? getting one and the extra fan inside near drive cases..
space for 1 more 120m fan worth getting one?

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