Welcome to the reciprocating air compressor section of my air compressor buying guide. If you are still not sure whether a reciprocating compressor is the right choice for you, be sure to start at the air compressor buying guide main page.

Are you looking for a rotary screw compressor? Visit my rotary screw compressor buying guide instead.

Buy a reciprocating air compressor

There are a lot of different types of reciprocating compressors, and even more sites offering them for sale. Want to be sure you buy the right air compressor, the air compressor that is right for you and your situation? Don't worry, I am here to help you.

In this buying guide I will teach you:

  • What the right type of reciprocating compressor is for you (you know the difference, right?)
  • What the right size air compressor is for you.
  • How to save money on your air compressor purchase.
  • What options you need and don't need
  • The most common mistakes when buying a reciprocating air compressor.

Who needs a reciprocating air compressor (in industry)?

Reciprocating air compressors still have a place in industrial settings — but a smaller one than they used to. For continuous-duty industrial work, a rotary screw is almost always the better choice. So who actually needs a piston compressor today?

  • Plants where compressed air is used intermittently — a few hours a day, not 24/7. A rotary screw doesn't like sitting idle; a piston is happy with it.
  • Applications that need higher pressure than a standard rotary screw can deliver (above 175 psi / 12 bar territory).
  • A backup or secondary compressor for a screw-based system. The piston is your contingency, the screw is your workhorse.
  • Smaller operations where the lifecycle cost of a screw isn't justified by the air demand.

If you need a lot of air, continuously, at standard industrial pressures — you probably want a rotary screw compressor, not a piston.

Don't start with "should I get a single-stage or a two-stage?"

Start with: what pressure do I need, how much capacity (CFM), and from what manufacturer. Once you've answered those, look at the machines that fit. The spec sheet tells you the stage count — you don't pick it, you read it. A single stage from Atlas Copco can outperform a two stage from a cheap brand, every time.

What's in this guide

Sizing & duty cycle

Pressure, capacity (CFM vs tank size confusion), tank sizing, duty cycle. The numbers that decide which machines to look at.

Single stage vs two stage vs duplex

What each variant is and how they compare. So you can read a spec sheet and recognise what you're looking at — without falling for the "two stage is always better" forum talk.

Quality & manufacturer

Why the brand on the label matters more than the stage count. Where the major brands actually build their machines. And why "peak horsepower" is completely nonsense.

Oil-free vs oil-flooded

Most people won't need an oil-free compressor. You only need an oil-free compressor for jobs like spray-painting or breathing-air.

Oil-free compressors are more expensive, require more maintenance and make more noise. If you don't really need 100% oil-free air (most don't), don't bother.

Electric vs gas-driven

With a gas-driven air compressor you can have compressed air anywhere. These are ideal for contract workers and work on-site where there is no electrical power.

Compressor-wise, they come with the same type of compressors pumps as electric compressors: there are single stage, dual stage and duplex untis available with a gas-powered engine.

A downside of the gas-powered air compressor is that it produces more noise and that it creates exhaust fumes.

Note that not all gas-driven air compressors are really portable. The bigger units can weight up to 600 bs (300 kg). These units are often installed on trucks or mobile equipment.