Yeah the ventilation is not an issue. My room is at a contsant 16C
PSU + GPU upgrade maybe. But I have no idea where to start. For sure I know the CPU would bottleneck any medium/high end GPU.
But I am looking at a GPU for "low/medium" settings only and that too in a 720p resolution. Maybe an old generation 450GTS? Maybe some other card which does not need power from PSU?