Humidity affects how efficient the coils transfer heat.
The more humidity, the harder the A/C has to work.
IIRC, the general rule of thumb is that A/C units in vehicles will work 30 degrees lower than the ambient temp.
-Steve
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1997.5 HMC4 Hummer H1 w/Slantback shell (Mine)
2006 Hummer H3 Adv. Package (Wife's)
M101A2 Trailer
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