Watch This Comparison Chart Video First...
Further down the page there is a written version of the chart from the video. However my suggestion is to read through the 4 steps which appear after the chart. These steps will help you choose and sort through the chart in order to choose the right air purifier for your needs. You'll notice that the chart has quite a few columns which cover aspects of buying an air purifier that most people fail to consider:
Purification Technologies - (how many?)
Replacement Filter Costs
Warranty Policy and Terms
Number of Speeds
Particle Removal (Allergens, Dust)
Immune System Threats (Germs, Virus, etc.)
Gas Removal (Odor, Chemicals, Smoke)
Ease of Use
Customer Service/Reputation (reviews)
4 Steps: How To Choose The Right Air Purifier
A few years back I wrote a comprehensive book about Air Purifiers entitled the "Consumers Guide To Air Purifiers". The book includes Video Reviews, Comparison Charts, and Money Saving Coupons. In it I also share my story - how I overcome allergies and asthma.
What most people commented on as the most helpful part of the book was the simple 4-step process which helped them choose the right Air Purifier:
STEP 1 - Learn The 10 Air Purifier Technologies - to determine which technologies are needed to solve your problem.
STEP 2 - Determine Your Square Footage - by understanding how doorways, high ceilings, and asthma affect your square footage number. This will help you avoid purchasing an air purifier that is too large, or small, to do the job.
STEP 3 - View A Current Comparison Chart to analyze which top models can match the technologies and square footage criteria that you learned in Step 1 & 2. (The comparison chart also saves you money by allowing you to compare replacement filter costs, warranties, and retail prices).
STEP 4 - Watch Video Reviews And Read My Reviews - to finalize and narrow your choice.
"This book should be called "Everything You Need to Know About Air Purifiers". It's a lot more than your average consumers guide. Richardson's vast knowledge base and personal testing experience in the field is unparalleled and his ability to condense information and make it understandable for the average reader is a pleasant surprise. If you're interested in air purifiers, you'll learn very quickly that this information is worth a lot more than it's sold for. For me the categorizing of technologies with the symptoms they deal with was most helpful. Now I know what to use for my allergies, and sensitivities to mold! Now I know how to get the most effective, cheapest, (and cheapest to maintain) air purifier. THANK YOU!"
- A.B. , Minnesota
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Discover Which Air Purifier Has The Technology To Solve Your Problem - And Start Breathing Better!
People ask me all the time: "Mark, which is the best air purifier?" My answer: "The one with the filters that match your needs." Of course most can't name all 10 technologies, and how each one can (or won't) help them.
So before you start your air purifier comparison online let me ask you these questions:
1) "What are the ten available technologies?" and
2)"Which ones will help your problem?"
1) Square ft.
2) Also how manufacturers determine square footage. The first part is fairly easy - measuring the room's length and width and multiply. If you have high ceilings add more feet onto your estimated square footage. Most air purifier square footage (as you'll find on the spec sheets for all models reviewed on this site) is based on 7 foot ceilings. For 10 foot ceilings add about 25%, Cathedral ceilings 30-40%.
Most air purifier manufacturers tend to exaggerate square footage so allow for that when comparing air purifiers. Some technology (like HEPA) requires that the air goes through the machine. Other technologies (negative ions, or Ozone) does it's work outside the machine in the room, which allows manufacturers to increase/exaggerate the numbers more easily. Most numbers are based on cleaning the air in the room once per hour.
For allergies/asthma you'll want to clean the air 2x more an hour for effective allergy relief or prevention.
1) Choose 3-4 models on the chart that fit your technology and square footage needs.
2) Be careful of replacement filter costs. In my opinion most manufacturers overcharge for their replacement filters.
3) When comparing air purifiers review the warranty policy. Often warranties that sound good initially have hidden costs (EX: pro-rated policies often make the company more money).