Everything You Need to Know Before Buying an Air Purifier

Your Guide to buying the best air purifier


An air purifier is an essential piece of equipment for anyone looking to improve indoor air quality. It works by filtering out harmful pollutants, allergens, and other particles that can cause health problems. This buying guide will help you find the best air purifier for your needs and budget, exploring factors such as size, type, technology, filters, maintenance, and pricing. We'll also cover the benefits of an air purifier and provide tips for choosing the right model. With the right information, you'll be able to make an informed decision and find the perfect air purifier for your home or office.

Key features

  1. Size - The size of the air purifier should be taken into account, as it needs to fit into the space you are planning to put it in.
  2. Air cleaning technology - Air purifiers can come with a variety of air-cleaning technologies, such as HEPA filters, activated carbon filters, ionizers, and more. You should understand the technology and decide which is best for your needs.
  3. Filter life - Air purifiers typically have filters that need to be replaced regularly. Be sure to check the filter life of the model you are considering, and make sure you will be able to get replacement filters in a timely manner.
  4. Noise level - Many air purifiers generate noise, so be sure to check the noise level of the model you are considering.
  5. Ease of use and maintenance - Make sure the air purifier you are considering is easy to use and maintain. You should be able to easily clean and replace filters, and adjust settings as needed.
  6. Energy efficiency - Look for an air purifier that is energy efficient and uses less electricity.
  7. Cost - Air purifiers can range in price, so make sure to check the cost of the model you are considering and compare it with other models.

See the most popular air purifier on Amazon

Important considerations


  • Air Quality Improvement: Air purifiers effectively remove pollutants such as dust, pollen, pet dander, odors, smoke, and other allergens and contaminants from the air, helping to improve air quality in your home and reduce the risk of respiratory problems.
  • Reduce Allergens: Air purifiers reduce the levels of allergens and irritants in the air, helping to reduce the symptoms of allergy and asthma sufferers.
  • Reduce Odors: Air purifiers remove bad odors from the air, helping to freshen the air and make your home smell nice.
  • Reduce Noise Pollution: Air purifiers help to reduce noise pollution in your home, creating a quieter and more peaceful environment.
  • Improve Sleep Quality: Air purifiers can help to improve the quality of your sleep by removing allergens and pollutants from the air, making it easier to breathe and creating a more comfortable sleeping environment.
  • Easy Maintenance: Air purifiers are generally easy to maintain and require minimal cleaning and filter changes.


  • Cost: Air purifiers can be expensive, depending on the size and features you choose.
  • Noise: Air purifiers can be noisy, especially for larger units.
  • Filter Replacement: Filters need to be periodically replaced, which adds to the cost.
  • No Complete Guarantee: Air purifiers may not be able to completely remove all pollutants from the air.
  • False Sense of Security: An air purifier may give people a false sense of security about air quality if they don't take other measures to improve it.

Best alternatives

  1. Ionizers - These devices electrically charge the air and draw in particles, which then stick to the device's surface.
  2. HEPA Filters - These air filters use a mechanical method to capture particles, using a tightly-woven filter.
  3. UV Air Purifiers - These devices use ultraviolet light to kill bacteria and other harmful microorganisms.
  4. Activated Carbon Air Purifiers - These devices use activated carbon to absorb pollutants from the air.
  5. Ozone Generators - These devices produce ozone, which is a powerful oxidizing agent that can eliminate some airborne pollutants.

Related tools, supplies, and accessories

  • Filter - The main part of an air purifier which captures and filters the air.
  • Replacement Filter - The filters need to be replaced periodically to ensure proper purification.
  • Ionizer - Part of an air purifier that releases ions into the air to trap pollutants.
  • Activated Carbon - A type of filter material used in air purifiers that helps adsorb odors and certain toxins.
  • Pre-Filter - An additional filter used to trap larger particles, such as pet hair, before they reach the main filter.
  • Humidifier - A device that adds moisture to the air to improve air quality, reduce static electricity, and help reduce the spread of germs and bacteria.
  • UV Light - Used to kill bacteria and viruses in the air.
  • Remote Control - Allows you to control the air purifier from a distance.
  • Timer - Automatically turns the air purifier on and off at preset times.

Common questions

  1. What type of air purifier should I buy?
    • When deciding which type of air purifier to buy, consider the size of the room, the type of air pollution you are trying to combat, and the type of filter (HEPA, activated carbon, etc.) you need. Also, consider if you want a portable or wall-mounted unit and if you need one that is energy-efficient.
  2. How often should I replace the filter of an air purifier?
    • The frequency with which you will need to replace the filter of an air purifier depends on the type of filter you have, the quality of the air in your home, and the amount of use the air purifier gets. Generally, the filter should be replaced every 3-6 months.
  3. Do I need to clean my air purifier?
    • Yes, it is important to clean your air purifier on a regular basis. Clean the exterior regularly with a damp cloth to remove dust, and check the filter and pre-filter monthly for buildup. Most air purifiers also require periodic cleaning of the ionizing wires and plates to ensure optimal performance.
  4. Are air purifiers noisy?
    • Noise level is typically measured in decibels, and most air purifiers are very quiet, usually ranging from 30-60 decibels. Most people can barely hear them when they are running.
  5. How do I know an air purifier is working?
    • Most air purifiers have an indicator light that will let you know when the filter needs to be changed. Additionally, you should be able to smell the air in your home to see if there is any noticeable difference.


A recent study by the University of California found that air purifiers can actually help improve sleep quality. The study found that air purifiers can reduce the amount of ultrafine particles in the air, resulting in a more restful sleep. This is especially important for those who suffer from allergies and asthma, as well as those who live in highly polluted areas. Source

Disclaimer: This buying guide was not created by humans, and it is possible that some of it's content is inaccurate or incomplete. We do not guarantee or take any liability for the accuracy of this buying guide. Additionally, the images on this page were generated by AI and may not accurately represent the product that is being discussed. We have tried to convey useful information, but it is our subjective opinion and should not be taken as complete or factual.