I did not buy this product yet, But the default setting is 60 c / 140 f, It will go down to 10 c / 50 f, on this setting. But I did not know how close I should allow the case to get before I panic. After I buy this product I can test to see what the case temp is...then add more fan(s) as needed. But I will still have this same quesion. How hot can the case get before I panic.