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There are a multitude of reasons why this could be, and there is absolutely no way of narrowing them down without a proper system performance test in order to diagnose it. A restriction in the system, too much refrigerant, too little refrigerant, too much compressor oil, deterioration of the desiccant in the accumulator or receiver-drier (which you have depends on whether your system has a fixed orifice tube or a thermal expansion valve)... those are just some of the possible reasons.

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