Hermetic compressors have a sealed housing with the motor also sealed inside, making them leak proof but not repairable. They are prone to not lasting as long as semi-hermetic compressors. Semi-hermetic compressors also have the motor housed with the compressor but the casing is bolted and can be easily repaired. They are designed for longevity, repairability, and reliability compared to hermetic compressors. The document provides information on hermetic versus semi-hermetic compressors, including their basic designs and suitability for repair.