Comment I would have made the "outdoor air" arrow change from blue to red to illustrate change in temperature (which is not obvious on current version). --Eusebius (talk) 09:25, 2 December 2008 (UTC)[reply]
But it is even hotter when it gets out of the air con unit, otherwise there would be no energy transfer. This should be shown in some way. --Eusebius (talk) 07:47, 4 December 2008 (UTC)[reply]