A vacuum pump is a mechanical tool used to remove air and moisture from the refrigerant lines before the system is charged. This "evacuation" process is required for all non-DIY systems to ensure the refrigerant remains pure and the system remains internal-corrosion-free. Using a high-quality vacuum pump is the only way to reach the required 500-micron level for our heat pump systems. If you are attempting a professional-grade diy-1 installation, this tool is an absolute necessity. It ensures that your multi-zone condenser will operate at its rated SEER2 efficiency. We provide various installation accessories in our parts section to support a clean vacuum process.