Be interesting to see how the computer fans work out. How many were you or Eric planning? For me, don't think they would be that satisfactory because don't think the airflow will be concentrated enough to give a strong blast for that quick cooldown to the face--at least not thru any type ductwork. Have been known to be wrong on occasion though so maybe this time too.
The 20k is repeated here
http://www.eng-tips.com/viewthread.cfm?qid=26952&page=22 and there is some discussion with varying different numbers for the btus here.
http://hvac-talk.com/vbb/showthread.php?s=d7b4a080a5fc7631b8e0db785807e14d&t=328492. Don't recall ever seeing a published number but older units horribly inefficient as compared to newer--mostly because of inadequate insulation, airflow & distribution--so needed & tended to be fairly large.
The evaporators in the 53-56 is probably 3 times the size of the one in your underdash unit and will freeze your you know whats off at the same time the passengers in the far away seats are sweating because the cold air never gets that far.
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