Easy to test whether fans would benefit you - take the side off the case for a day. If temps fall a lot, then ventilation is your friend 
(69 degrees is fine! My personal "comfort zone" is below 75, but many push to 80, and Intel don't throttle the chip until about 90. And it does throttle - hence it's really really hard to kill them with heat
)

(69 degrees is fine! My personal "comfort zone" is below 75, but many push to 80, and Intel don't throttle the chip until about 90. And it does throttle - hence it's really really hard to kill them with heat
)