Which outcome occurs when mineral oil contaminants accumulate excessively within an HVAC evaporator core?

💡 Explanation

When mineral oil builds up in an evaporator core, the layering effect forms an insulating barrier because oil reduces the thermal conductivity between the refrigerant and the evaporator walls leading to diminished heat transfer. Therefore, reduced heat transfer efficiency results, rather than overcurrent, temperature increase, or valve blockage which involves separate processes.

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