Choose an air compressor powerful enough for all your tools

Some air tools, like ventilators, require more air than others so it's important to select an air compressor that is appropriate for medical or commercial purposes. Air compressors are measured by the cubic feet per minute, or CFM, of air they produce. Choose air compressors with a CFM rating 1.5 times higher than that of your most powerful tool. If you plan to run more than one tool off the same air compressor, however, add the CFM ratings of all your tools and multiply by 1.5 to gauge the CFM rating you will need.

I recommend: Check the CFM rating of your air tools before buying any air compressor and then comparison shop by CFM rating at Air Compressors Direct.

Select air compressors that can handle all your projects

Whether you need a medical air compressor or an industrial air compressor, the type you choose depends on how you plan to use it. Portable air compressors can handle small jobs like filling tires or powering a nail gun. For more complex tasks like sanding or grinding, select a larger model that will provide enough air flow and pressure to keep power-hungry tools operating efficiently. Air tank capacity should also be considered.

I recommend: For smaller commercial or medical jobs, choose air compressors from vendors like Max Tool, that offer a PSI, or pounds per square inch, rating of 125 or 150 PSI and a CFM rating of 6.0. Northern Tool + Equipment offers industrial strength air compressors with higher horsepower for heavier workloads. Check Compressor World for air tanks — an air tank capacity of 30 gallons should be adequate for smaller commercial and medical users, although high performance jobs may require a larger capacity.

Decide on gas or electric, reciprocating or rotary screw air compressor models

Gas-powered air compressors can be used almost anywhere but are more expensive and must be vented when used in enclosed spaces. That makes them impractical for medical, dental and laboratory users. Electric air compressors are a convenient and inexpensive alternative and are ideal for both the medical and commercial buyer who doesn't need the flexibility of off-site use. Reciprocating air compressors, also known as piston-driven compressors, are the least expensive and are adequate for many applications but are not suited for continuous use. Rotary screw air compressors, on the other hand, are workhorses which can run continuously and are well suited for high-demand applications.

I recommend: Tools USA offers a good selection of air compressors, including rotary screw models. Find gas-powered air compressors at National Tool Warehouse, reciprocating air compressors at Air Power Products Limited. Not sure which type of air compressor you need? Air Compressors Direct offers a simple selection tool to help you find the best one for your needs.