The amount of heat transferred away from the processor is proportional to the temperature difference between the processor's temperature and the air temperature inside the case. Your PC's case probably already has a case fan that draws air out of the case, and the power supply also has a fan that does that, so, if you want to reduce the temperature inside the case.
Thats a pc's cooling in short. Now the room where is it situated. Windows is it painted? Does it get direct sunlight between the hottest parts of the day. is it when its cold still the hottest room?
Clear windows, Yes it gets sunlight. Yes still very hot room well the rest of the house is freezing. NO windows on the PC case thou.