Opening window wont do the trick. Insulation in walls prevent it. I have record for air cooling.
Ambient is 6C with strong breeze. 3rd floor with elavated apartment so strong wind
GPU start temp is 7C
CPU clocks maxed around 19C
GPU max temp was 47 and AVG 44. Its on my sign. Building a temp. setup on outside is very worth it :) 10x better then AC trick