A hermetic compressor is a fully sealed unit where the motor and compressor are housed together inside a welded steel shell. This design is the standard for Mobile Home AC Condensers because it prevents refrigerant leaks and keeps the internal components protected from dirt and moisture. Because the unit is welded shut, it cannot be repaired internally; if it fails, the entire Compressor must be replaced. These compressors are exceptionally quiet and reliable, making them a centerpiece of ACIq and MrCool technology. They are cooled by the refrigerant gas itself, which helps maintain a steady operating temperature during the peak of summer. You can find replacement hermetic units in our Parts department for various tonnage ratings. Their "single-shell" construction makes them ideal for the compact footprints required in residential and light commercial applications. It is the most common and maintenance-free compressor design in the modern HVAC world.