Air Conditioning

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guys i've been hearing that ferions that are made in china damage the compressor and the best ferion is the one made in usa, actually i am totally confused, because i dont don't know the right quantaty to charge and which country manufacturer give ice cool air because in my country the tempereature during day reaches 45 degrees and i can't feel the a/c effect unlike at night the air comes out so cold, so what could be the solution?? sorry if i miss spelled ferion