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Published: 21/10/2020

How to Choose An Air Compressor: Buying Guide

Choosing the right air compressor for your needs can be difficult if you don’t know what you’re looking for. It’s important to do your research because using the wrong type of compressor can lead to less efficient production and even less clean air. 

Our experts have created this air compressor buying guide to help you when searching to buy or hire an air compressor. We’re a leading supplier of air compressors, so you can expect a comparison of new and used compressors, a list of factors to consider, and the benefits of hiring or buying a compressor.

Why use an air compressor?

Air compressors exist in both domestic and commercial environments. They are mechanical devices that intake air, increase the pressure to compress it, and then use the product as energy.

They can be used to power many industries, big and small, and are often used with applications for air tools. 

Using compressed air as a power source can be more energy and cost-efficient than its alternatives. Plus, there is such a variety of compressors to choose from that there will always be something to suit your compressed air needs.

Should you buy a new or used air compressor?

Though a new compressor may be preferable, there are some situations in which it makes sense to buy a used machine. When you buy from a reliable supplier such as Air Supply, you can find great deals.

New compressors

• Since they are brand new, you can expect a longer lifespan from your machine.
• If you plan on using the air compressor frequently, opting for something new could be better and reduce the chances of repairs.

Used compressors

• If you need a short-term solution for your business, a used compressor can bridge the gap until you upgrade or invest in something newer.
• Only require an air compressor for irregular use? Consider buying a used piece of machinery for a more cost-effective purchase.
• Used compressors are budget-friendly for those looking to spend a little less.

For a complex breakdown of the pros and cons of new and used air compressors, take a look at our blog “New air compressors vs used air compressors: how to decide“.

Oil or oil free?

We’ve made the below table to clearly outline the differences between oil and oil-free compressors.

If you’re unsure whether an oil or oil-free compressor is the right choice, consult our Buying Guide for Oil Vs Oil Free.

Types of air compressors

Here is a quick summary of the different types of compressors:

• Rotary screw: Ideal for continuous use, working at high speeds with a low flow rate.
• Reciprocating/Piston: One of the most energy-efficient. Known as the industry standard, delivering high pressure and high power with a range of pressures.
• Scroll: Quiet operation, perfect for industries that require clean compressed air systems.
• Rotary vane: Ideal for pneumatic tools and automotive applications, but not limited to this.
• Centrifugal: Used to manoeuvre gases in large industrial applications, often in manufacturing.
• Axial: Mainly used in large industrial sectors.

To find deeper explanations of their uses and advantages, read our blog: “Types of Air Compressors and What They Are Used For”

Factors to consider

Commercial or domestic use?

Depending on the environment you’re working in alters the type of compressor you require. In a domestic, DIY space, you’re likely to be most concerned about size, price, and power. You’re probably only going to be using one power tool at a time, and it won’t be in operation for hours at a time.

Compressors in a commercial environment, however, often require a large, consistent power supply. Higher horsepower means more power, and a larger tank means more compressed air.

Air Supply offers both small and industrial-sized air compressors for hire and sale. We understand that everyone’s needs are different, and we cater to this. Whether you’re a small business, a one-man band in your garage, or a national company, we have something for you.

What applications will you use?

Air compressors can be used for a variety of tasks – they are incredibly versatile. But it’s important you choose the right compressor for your requirements.

They can be used to help inflate tyres on a car or bike. A small task like this would only require a compact air compressor because it doesn’t require constant air flow.

Compressed air can also be used for spray painting and pressure washing. These jobs require a large volume of air due to continuous operation so a more powerful compressor with a larger tank would be ideal.

Construction companies often use compressed air for their air tools, such as nail guns, hammers, and drills. Not having to use electrical-powered equipment makes the tools lighter and smaller, meaning they’re easier to work with.

This is why it’s important to know how the compressor will be used, to help find the right sized one for your needs.

CFM requirements

Once you know what application you are going to be using, find out which CFM (cubic feet per minute) you require. Your chosen air compressor should be compatible with the CFM, so you have the right amount of airflow needed to power the tool.

Follow this link to our article that explains how to calculate the CFM your air tools need, and what size compressor you need for them.

For a more detailed explanation of factors to consider before you buy, see our blog: “Questions to Ask Yourself Before Buying an Air Compressor”

How Air Supply can help

Air Supply specialises in the supply of top-quality new and used air compressors, holding one of the largest stocks in mainland UK. We stock some of the best industry brands, including Atlas Copco, Compair, HPC, Ingersoll Rand, Boge and more.

Choosing a compressor isn’t the easiest of decisions. If you’re still unsure of what compressor is best for your needs, get in touch with us today with any questions you might have, browse our huge range of used stock, or take a look at the new equipment!