Nissan probably has better insulation than most brands. thats the only reason i see as to why their ac is cold.
i believe that there was a time when nissan aircons really were cooler than the others.
but today's aircons are just as cold as nissan's was/is. nakahabol na sila, sa tingin ko.
i used to have a sentra. its heat insulation was nothing to crow about, in my opinion.