will a brand new ac unit out perform a 12 year old unit as far as cooling or is a ac unit only capable of lowering the temperature 15-20 degrees old or new? my old unit is a 15k btu coleman and doesn'...
Are you getting 20 degrees differential between the air-in and the air-out? Have you checked the plenum divider is well placed and sealed properly in the lower section? Have you ever been topside to remove the cover and clean the coils? Are you parked broadside to the afternoon sun? Shade?
Generally an older 15KBTU will move the same heat out as a new 15KBTU A/C unit.
Yes you probably need a second cooling unit.
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