What do you think?
 

In theory -

Background:
Our body generates heat; and our skin regulars the body temperature acting like a heatsink.

Condition:
Standing outside a building or house under calm condition (less than 5 Mph wind) in the shade versus standing inside a building with two windows and two fans directly opposing each other and blowing at the same direction at about 20 mph.

Question:
Do you feel cooler in the building or outside?

I think that depends what's the temperature.
My guess:
If the temperature is the same I think it might be colder inside.

Same temp condition :) Different wind speed.

more wind = feel colder

More wind = Feel colder = heat being removed from the skin = heat being removed from heatsink = higher thermal loss of any thermal generator

Put your hand in front of the intake fan of your PC; your hand feels "colder" from the draft drawing heat from your hand.

Put your hand in front of the exhaust fan; your hand may feel warmer; air blow across the case absorbs the temp from heat generator(s).

Just an 80mm fan will provide ~25-35 CFM; 2x80 = ~50 to 70 CFM in a case that is much smaller than a room; I have not figured out the velocity but it will certainly be higher than say inside a room where there is no wind speed to speak of. Otherwise, paper will be flying around.

Bottom line; a well vented case is far more efficient than open case.

of course:) who ever stated otherwise?

obviously, but an open case is easier to work with

Only if you need to test 50 heatsinks in a year:)

+ upgrading Vcard monthly
+ removing HDD out for "cleaning"
+ replacing power supply regularly just for fun

:D

It serves no other purpose except "looking cool" in front of your peers and endangering yourself and others in the same room.

If my kids use open case PC, I would have asked them to move out before the house gets burnt down.

I recently bought a new case (Thermaltake Soprano) which has 2 120 mm fans and 1 92 mm fan. Still the temperature is 4-5° higher then when it's open.

It seems I got to reorganize my cables, I think.