I have some pc fans that are around 1 amps, 12 volts, 12 watts, times 6, that's 72 watts of power. Does this heat end up in the output of the fan?

how would i simulate this, just change the temperature coming out of the fan if it is an external inlet fan? or should i make a body and make it 12 watts, then blow the fan through it?

im assuming it will not make much of a difference, but i am doing a simulation now that is very close to the limit i want it at, and any added heat would make me depressed.

-Shane