Cordless HVAC vacuum pumps finally work. The Milwaukee 49-50-5080 (8 CFM, M18 powered) pulls to 30 microns on a 3-ton residential split in roughly the same time as a corded ROBINAIR 15500 — without the 100 ft cord or a generator run. For commercial RTU work (15+ tons, long lineset evacuations), corded is still the safer bet for the 4-6 hour pumpdown cycle.
What makes a "working" HVAC vacuum pump
The industry standard for evacuation is pulling to 500 microns or lower with a dry system and holding it. Getting there takes both displacement (CFM) and a good-enough pump oil seal to prevent backstream.
Corded 6-8 CFM two-stage pumps have been the default for 30 years. A ROBINAIR 15500 or 15601 pulls to 25-50 microns and holds. Everyone knows these tools; they've earned the trust.
Milwaukee 49-50-5080 — the real test
8 CFM, M18 battery powered, two-stage, digital micron gauge built in. On a clean 3-ton split with new 25-ft lineset, pumps to 30 microns in ~35 minutes on a 12.0Ah HO battery. Essentially identical to a 6 CFM corded pump.
Battery runtime at continuous draw: 55-70 minutes on a 12.0Ah HO. You can finish almost any residential split on one battery with 15% to spare. For back-to-back calls, a 2-battery rotation covers a full shift.
Where corded still wins
Commercial RTU evacuations on 15-30 ton systems with 100+ ft linesets. These take 4-8 hours of continuous pumpdown and battery swaps interrupt the vacuum hold. Run a corded pump on a 20-amp GFCI circuit and walk away.
Pumping in humid conditions where the refrigerant has absorbed moisture. The continuous-run nature of a corded pump lets you heat-cycle the system during evacuation; cordless runtime interruptions can freeze moisture in the coil.
What a cordless HVAC truck looks like now
Milwaukee 49-50-5080 vacuum pump, M12 2277-22 12-in-1 digital manifold, M12 inspection camera (2311), M12 2471-20 compact drill for panel work, M18 FUEL reciprocating saw for ductwork cutouts. Ten batteries across two chargers. No corded tools on the truck except a small backup pump for long commercial jobs.
That entire setup fits in a single 2-level PACKOUT rolling stack and weighs under 90 lbs.
Joshua runs Charged Tools out of St. Louis. Background spans e-commerce operations, software engineering, and hands-on tool use in the auto trades. Every editorial piece on this site is written or reviewed by Joshua before it ships.
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FAQ
Does the 49-50-5080 need separate vacuum oil?+
Yes. Two-stage vacuum oil (Milwaukee 49-08-0000 or any ISO 22 vacuum oil). Change every 30-50 evacuations or after any pumpdown on a wet system. Oil is cheap ($15-25/qt) and lets the pump hit deep vacuum. Running dirty oil is the #1 reason cordless pumps get blamed for "not pulling deep enough."
Can I evacuate a new mini-split install with a cordless pump?+
Absolutely. Mini-splits (1-3 tons, short linesets) are where cordless vacuum pumps shine. The 49-50-5080 pulls a typical 12k BTU mini-split installation to 500 microns in 20-25 minutes on a 6.0Ah battery.
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