What they said and if done right even in temps close to 100 you can deal with heat without ac. I think letting the fan pull air from the base of the windshield to a very slightly open drivers window might actually help CD enough to offset the additional load, but I kill the fan when I canget enough out of fresh air in my face without the fan, just have the glass down about 1-2 inches.
For shots of cool air hit the ac when you have to slow down, max cool, high fan, resirculate, then kill the ac when you come out of dfco, it's free like that and the cool evaporator will give you cooler air for a little while, then go back to fresh natural flow.
regards
mech
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