Best garage shop air compressor

Size is two numbers: how much air the pump delivers (CFM at a pressure) and how much it can store (tank gallons). A pump that delivers enough air runs the tool continuously. A bigger tank only rides out bursts. Most garage tools fall into one of three groups, and the sizing pages on this site work each out in full.

• Burst tools: nailers, brad guns, tire inflators and blow guns use a little air for a second. A 6-gallon pancake handles them. See air compressor for nailers and trim and for tires and blow-off.
• Intermittent tools: an impact wrench, a ratchet or a staple gun pulls more air for a few seconds. A 20-gallon tank with a decent pump keeps up. See air compressor for auto wrench work.
• Continuous tools: a sander, a die grinder, a spray gun or a sandblaster uses air the entire time the trigger is down. These want a large two-stage pump. See sanding and grinding and spray painting.

The air compressor CFM calculator adds up the tools you pick and returns a CFM target. Compare it with the CFM figure on the listing at the pressure your tool needs, which is printed on the compressor's data plate. If a listing does not state the figure, we say so rather than guess.

This page was researched from manufacturer listings, published specifications and owner reviews, not a bench test. Where a number is not stated in our sources, check the listing before you buy.

A one-car garage is about 12 x 20 or 12 x 22 ft. With a sedan parked 12 in from the door, you keep roughly 3 ft behind the front bumper in a 12 x 20 and about 5 ft in a 12 x 22. A pancake compressor is small enough to put under a bench. A 20-gallon unit wants a corner, a cart or a spot beside the workbench. A 60-gallon vertical wants a permanent corner of its own.

Think about three things before you drop a compressor in the bay.

• Noise. A garage amplifies sound. An attached garage shares a wall with a bedroom more often than anyone admits. Oil-free pumps are usually louder than oil-lubricated ones; "ultra quiet" and "quiet series" units are built to cut that. Read the decibel figure on the listing and compare it with the other units, rather than trusting the label.
• Heat and ventilation. A compressor makes heat and sucks in dust. Put it where the intake can breathe, away from a sanding station and away from the car.
• Drain and moisture. Air compressors collect water in the tank. Drain it regularly, and read the dehumidifier page if your garage runs damp.

The 20-gallon compressor fit sheet and the 60-gallon fit sheet run the footprints through all six garage sizes.

This is where compressor shopping gets real. A 2 HP motor on 120V pulls a heavy load, and a 15 A garage circuit that also feeds the lights and an outlet near the freezer can trip when the compressor starts. A 20 A dedicated circuit is the safe assumption for a 2 HP 120V unit. The listing gives the amps; read it.

A 60-gallon two-stage unit like the Campbell Hausfeld is a 230V machine. For 230V loads the NEC full-load current tables (Table 430.248 for single-phase motors) give about 12 A for a 2 HP motor and 17 A for 3 HP at 230V, and the breaker is sized from 125 percent of that, with wire from Table 310.16 at the 60 C column for typical NM cable. These are the same figures the 240V circuit calculator uses. For a 5 HP motor the table gives 28 A. Because compressors start under load, ask your electrician about the right breaker type and wire, and have a licensed electrician confirm the circuit and the receptacle.

If the choice is between a 120V 2 HP unit and a 230V one, the 230V compressor draws half the current and is kinder to a long run. The general guide 240V in a garage explained walks through what it takes to get that circuit into the bay, and the auto workshop amps page shows how the compressor stacks with the rest of an auto shop's load.

Oil-free pumps need no oil changes and tolerate being tipped, which suits a unit you move on a cart. They are generally louder and shorter lived than oil-lubricated pumps of the same size. The pancake units and the 20-gallon units in this roundup are oil-free. Oil-lubricated two-stage pumps run cooler and quieter at the same output and are the norm for 60-gallon stationary units; check the listing for the pump type and the oil specification.

For a garage, the practical test is whether you will do the maintenance. An oil-free compressor asks for a regular tank drain and little else. An oil-lubricated one asks for a dipstick check, an oil change and a place to keep the oil. Pick the one you will actually care for.

The same logic applies to the filter and regulator on the line. Water in an air line ruins a paint job and rusts tools, so a water separator near the point of use pays for itself. And a coiled or retractable hose near the compressor is more convenient than a hose across the garage floor; the Flexzilla retractable reel holds a 50 ft, 3/8 in hose and mounts to the wall or ceiling.

The hose matters more than most people think. A thin, stiff, kinked hose chokes a tool that the compressor can run fine. A 3/8 in hose is the standard for impact wrenches and sanders, and a longer hose loses pressure along its length, so run the shortest hose that reaches. The Goodyear 50 ft hybrid hose is listed at 300 PSI and described as kink free, which is the property you want when you drag it around a car.

For a starter set, the VEVOR 71-piece kit comes with a 1/2 in air impact wrench and a set of accessories according to its title. If you already own cordless tools, an air wrench is not essential; the DeWalt 20V MAX impact wrench does many of the same jobs without a hose, and keeps the compressor free for tires, blow-off and paint.

Bring a pair of safety glasses and ear muffs for any air job. A compressor tank is a pressure vessel, so read the manual, set the regulator to the tool rating and never exceed the tank rating. The garage workshop guide covers the rest of the safety basics.

Pick the spot by the door, not the middle. Compressors work best on the wall nearest the work, so the hose stays short. In a one-car garage the front wall behind the bumper is usually the only free space, and a pancake compressor can hang on a shelf there. In a two-car garage (20 x 20 to 24 x 24 ft), a 20-gallon unit fits beside the workbench and a 60-gallon vertical fits in a corner with 24 in of clearance in front for the drain and the controls.

Plan the hose. A reel near the compressor and a hose that reaches the whole bay without crossing the car lane keeps a tripping hazard out of the garage. Plan the outlet too: a 120V unit on a dedicated 20 A circuit wants a receptacle within reach of the cord, since a long extension cord starves the motor. The voltage drop calculator shows how much a cord run costs.

If you only have a one-car bay, use the garage shop layout calculator to see whether the compressor and your other machines fit with a car in the bay. Tire work, blow-off and light nailing are the usual reasons to own a compressor at all, and the pancake or the 20-gallon is the right answer for them.