Air Purifier vs Dehumidifier: How To Know Which One Is Best For You

Are you looking to improve the oxygen quality in your home? Or perhaps you have dampness issues in the basement or in a particular room. Whatever the case may be, if you’re not in the market for a proper air purifier or dehumidifier then you should be.

These two machines offer so much to improve the air quality in your home. But, most people assume that they perform the same function. Let me tell you, they certainly do not. Needing cleaner air and wanting to get rid of the dampness in your basement are two totally different problems.

So the question is, when it comes to a purifier Vs dehumidifier, which one is best for you? Well, we hope to break that information down in this article and help you determine the difference and exactly which machine is the one to solve your air quality needs.

Air Purifier Vs. Dehumidifier Comparisons

Feature 1
Feature 2
Feature 3

Air Purifier

Cleans air of toxins and debris

Removes mold spores

Does not remove high levels of moisture


Does not significantly clean air of toxins and debris

Helps to remove mold spores as it removes moisture

Does remove heavy amounts of water from the air

Air Purifier Vs. Dehumidifier Pros & Cons

Pros 1
Pros 2
Cons 1
Cons 2

Air Purifier

Cleans your home of dust and other microscopic debris

Really great for people with asthma or respiratory issues

Does not remove humidity

Can be found to be noisy


Removes high levels of humidity

Helps prevent spread of mold spores

Does not remove toxins or dust

Can be found to be noisy

A Deeper Look Into The Two Machines

Not only do you have to choose whether or not a purifier or dehumidifier is right for you, you also have to figure out which type of each would work best. There are many types of air machines as well as a few different kinds of dehumidifiers, so knowing these options will help you narrow down the search.

Oxygen Purifiers


These types of air cleaners use something called corona discharge to purify the air of microscopic debris


The more common type, uses a HEPA (high efficiency particulate air) to circulate the room and spit out clean oxygen.

Ozone Generating

These work similar to the ionic types by actually changing the makeup of the oxygen levels by altering its molecules.


Uses absorbent materials and substances to trap odors, smoke, and debris.

UV Lighting

Sucks in dirty air and kills any germs and other micro-organisms with a powerful blast of UV light.



Sucks in the heavy, moist air and draws it over cold coils. This traps and removes the water from the air.


Uses absorbent materials to hold the water in the oxygen we breath. Like a sponge.


Uses what is called a Peltier pump to filter the wet air over a cool area and trap vapor. It’s known to be quieter and more energy efficient which is great for residential homes.


A more complex unit and mostly used in commercial settings. It uses a high tech ionic membrane to filter the oxygen and trap the water.

Read more on the benefits of a dehumidifier here.

Let’s Look at a Few, Shall We?

Now that we’ve covered the many different types of machines available, let’s narrow it down and look a few that are perfect for residential use, since that’s’ the main focus of this article.

Using a dehumidifier or air purifier for mold. If you have a damp basement then you may want to use a dehumidifier to lower moisture levels but, depending on how long you’ve had the problem, you may also need a purifier to remove any mold spores. If this is you, then check out this Frigidaire model and this GermGuardian air purifier. Using an air cleaner or dehumidifier for mold is essential for this problem.

Frigidaire FAD504DWD Energy Star 50-pint

GermGuardian AC4300BPTCA 3-in-1 Air Purifier with Pet Pure True HEPA Filter

For asthma, a dehumidifier or air purifier is almost a necessity. If you, or a member of your household, suffer from asthma and other respiratory issues then you should really be keeping the quality of your home’s air fairly high. Check out this Holmes air purifier. It’s inexpensive, highly rated, and is a desktop version so you can stick one in every room.

Holmes Small Room 3-Speed HEPA Air Purifier with Optional Ionizer

And finally, if your issue is merely just a heavy, wet climate and you just need some help lowering the moisture levels in your home then check out this heavy duty dehumidifier. Using a dehumidifier or oxygen cleaner for basement moisture problems can really make a difference. You can keep it on 24/7 and it has a hose attachment for draining so you don’t have to dump a bin every time it’s full.

Frigidaire FFAD7033R1 Energy Star Dehumidifier with Effortless Humidity Control, 70-pint


So, to revert back to the question at hand; an air purifier Vs dehumidifier, which one is best for you? Well, that answer will differ for everyone, obviously. But for me, the best one is the Frigidaire heavy duty dehumidifier because I do live in an extremely damp coastal climate and really depend on a unit like this to keep moisture levels down in my nice home. Also, a dehumidifier or air purifier for allergies is really great; my kids are both super sensitive during the Summer months and the windows are always open. These two machines really help them to breath easier.

To summarize, a purifier only cleans the oxygen we breath while a dehumidifier removes heavy moisture levels (which actually help with purifying a bit). So ask yourself, which one do you need? Or do you need both?

If you have any questions regarding these two machines feel free to comment. And share your success stories with us! Share which product worked best for you and why. We love to hear from our readers.