Single-stage, piston-type air compressors are the most common models for home use and work well for many applications. An electric motor or gasoline engine drives a piston, which compresses air and forces it into a storage tank. As the piston forces more air in, the air pressure rises. Once the pressure reaches a specified level, the compressor stops running. As you use the stored air to power a tool, the compressor restarts to build the air pressure back up.
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Two-stage compressors have two pistons. The first compresses the air and pushes it through a check valve to the second piston, which compresses it further and delivers it to the tank. These compressors are usually heavy-duty, commercial models that can deliver a greater volume of air at higher pounds per square inch (PSI) levels. They're good choices for continuous use in shops or if you need to power multiple tools at once.
Stationary air compressors are large air compressors for a garage or workshop. These high-horsepower models with large storage tanks allow for longer periods of uninterrupted use. They typically have a vertical design that reduces the amount of floor space they require.
A portable air compressor is more compact than a stationary model. It has a smaller storage tank and handles or wheels that allow you to easily move it to different work areas. Portable air compressors are good for light, quick applications, such as airbrushing and powering most types of nail guns. They come in several styles so you can choose the best portable air compressor for you:
Always follow the air compressor and air tool manufacturers' instructions for use, maintenance and safety.
Electric compressors are the most common type of air compressor. These require less maintenance than gasoline-powered models, are quieter and work in any dry area with a ready electrical supply. Electric compressors are suitable for working indoors. Many home-use compressors function on 120-volt household current, but larger models may have different requirements. A portable electric compressor requires a suitable extension cord, which limits mobility. Follow the manufacturer's specification for extension cords and see Power Cord Safety Tips. Depending on the model, inflators plug into a 120-volt household outlet or a 12-volt vehicle accessory outlet.
Gasoline-powered air compressors are a good choice for outdoor work areas where electricity is limited or unavailable. A gas air compressor typically has more horsepower than an electric model, so it can generate greater PSI.
Don't use an electric compressor in a wet or damp area. Don't use a gasoline-powered compressor indoors or in a confined or unventilated area.
The horsepower (HP) rating for a compressor indicates the power output of the engine or motor. Higher horsepower creates greater air pressure, measured in PSI. Higher PSI means the compressor can store more air in the tank, allowing you to operate air tools longer. Cubic feet per minute (CFM) and standard cubic feet per minute (SCFM) describe the volume of air a compressor delivers at specific PSI levels. The CFM value changes as PSI changes. As you lower the PSI output, CFM increases. A compressor with a higher CFM rating can deliver more air and is better suited for heavier applications, such as operating air wrenches and framing nail guns.
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Compressor manufacturers rate storage tank size in gallons. Smaller tanks — around 4 to 6 gallons — are sufficient for many projects, such as airbrushing and operating brad nailers or nail guns. Larger tanks store more compressed air at higher pressures. They're suited for larger tasks that require sustained air flow, such as automotive work and remodeling projects.
While horsepower indicates a compressor's power output, CFM ratings at specific PSI levels determine what tools the compressor will power.
To choose the right air compressor for tools, you should understand the air compressor features that can handle your jobs and simplify your work:
Air hoses must meet the specifications of the compressor and the tools you plan to use.
The right parts and accessories are crucial to completing your projects safely and efficiently. Some of the main types of air compressor parts include:
If you just bought a new air compressor or you're in need of multiple parts, you can also look into accessory kits that are designed for a variety of tools or repairs.
The cost of a quality air compressor can vary greatly depending on the model, the size, the volume of air it holds and a variety of other features. The average price can range anywhere from $100 to $15,000 or more. So, if you’re trying to determine your budget, make a list of all the must-haves and try to find the best model at the right price point.
The decibel (dBA) rating of an air compressor varies depending on the type of compressor and the power source. Electric air compressors lack a fuel-powered engine, so they often make less noise than gas-powered models. Quieter air compressor models operate anywhere from 50 to 70 dBA. However, louder compressors can operate at more than 90 dBA.
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