The right HVAC vacuum pump depends on the systems you service, hose and core-removal setup, required refrigerant compatibility, portability, oil-management workflow and manufacturer procedures. Nominal CFM matters, but it does not determine evacuation speed by itself. These are specification comparisons, not a universal ranking. Kit contents, voltage, refrigerant approval, service support and current availability can vary by exact SKU and market. Do not use the unsupported rule that “CFM squared equals maximum system tonnage.” Evacuation time depends on system volume and moisture load plus the effective conductance of the entire setup. Large-diameter, short vacuum-rated hoses and core-removal tools can reduce restrictions; a manifold or small hose can become the limiting point even with a larger pump. Yellow Jacket's evacuation-system documentation illustrates the effect of flow restrictions: its systems combine larger vacuum hoses, core-removal valves and direct connections to reduce evacuation time compared with a regular 1/4-inch manifold workflow. The exact improvement depends on the equipment, setup and procedure, so treat manufacturer demonstrations as configuration-specific rather than a guarantee. There is no universal CFM-to-tonnage formula. Match pump capacity and the entire hose/core-removal setup to system volume, target vacuum and the equipment manufacturer's procedure. No. Restrictions, leaks, moisture and oil condition can dominate evacuation time. Measure with a standalone micron gauge at the system. NAVAC currently labels the NP4DP discontinued while retaining its specifications and documentation. Confirm the current replacement and support before purchasing. HVACProSales Product Resources Review HVAC tools and instruments, or ask for help when vacuum-pump selection depends on system size, evacuation workflow, portability, and service requirements.Verified Pump Comparison
Model Published flow Published ultimate vacuum Published weight Important selection note Fieldpiece VP87 8 CFM 15 microns at input ports 27 lb Two-stage rotary-vane pump, 3/4 HP brushless DC motor, RunQuick oil-change system and multiple inlet sizes. Fieldpiece lists A2L certification. NAVAC NP4DP 4 CFM 15 microns 24.3 lb Two-stage AC-motor pump with 1/4, 3/8 and 1/2 inch flare inlets. NAVAC currently labels this model discontinued. Yellow Jacket SuperEvac PLUS II 6 CFM 6 CFM Confirm by exact model documentation 25.9 lb Current PLUS II line; the 6 CFM version lists 1/2, 3/8 and 1/4 inch male-flare intakes and a 36 oz oil capacity. How to Choose Pump Capacity
Evacuation Setup Matters as Much as CFM
Frequently Asked Questions
How many CFM should an HVAC vacuum pump have?
Does a larger vacuum pump always evacuate faster?
Is the NAVAC NP4DP still a current model?
Manufacturer Sources
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Quick answer: The Fieldpiece VP87 is a current 8 CFM, two-stage option with a 27 lb published weight and on-the-fly oil changes. The NAVAC NP4DP is a 4 CFM, two-stage reference model that NAVAC now marks discontinued; its published weight is 24.3 lb. Yellow Jacket's current SuperEvac PLUS II line includes 4, 6, 8 and 11 CFM versions. Compare exact part numbers and current manufacturer documentation before purchase.
Safety and service: Vacuum pumps are intended for trained HVAC/R personnel. Follow the pump and equipment manuals, refrigerant-specific requirements, ventilation rules, electrical precautions, PPE guidance and local law. Do not use a pump with a refrigerant or atmosphere unless the exact manufacturer documentation permits it.