The AC-powered Dometic Passagemaker condensing unit has hermetically sealed compressors for quiet and efficient operation. Passagemaker units effectively cool one or more cooling boxes of virtually any configuration. These condensing units have a small footprint for installation in tight spaces. The electrical box can be mounted remotely. The chassis has vibration isolation mounts to limit vibration transmission to the mounting surface. The compressor is also attached to the chassis with vibration isolation mounts, limiting the amount of noise generated. The filter is replaceable without any loss of refrigerant charge, and the sight glass monitors the system's refrigerant charge.