Air Purifier VS Dehumidifier

Air Purifier VS Dehumidifier: Which Is Better?

An air purifier is not a dehumidifier. Period. They might look the same, comes with air vent and filter, but the functionality is on a different spectrum. In this post, I'm going to touch on every little detail about both home appliances and what are they here for. I'm also listing down the differences between them for the sake of comparison. At the end of it all, you will have a better understanding of your needs and make the right purchase.
Short answer
Air purifier cleans air. Dehumidifier removes moisture.
Long answer

Is no secret manufacturers will toot one's own horn on EVERYTHING. No exception with the majority of the dehumidifiers out there. A small dehumidifier will be able to clear out 10-20 liters of water per day with 10-12 hours of operation. A large mechanical dehumidifier will be able to triple that at around 30-60 liters of water. Impressive numbers but the room must be in the manufacturer's "perfect" condition. Expect an exceedingly high humidity level at 80% with the temperature at 86°F.

So what does all this means? Dehumidifier is a fraud? Nope. On the contrary, it can work even in the most extreme condition. Just don't expect your humidity problems to be miraculously gone the next day.

Air Purifier VS Dehumidifier

Air purifier comes in different sizes and shape of form including a slim tower framework. Barring the renewable type, dehumidifier is typically in boxy shape to accommodate a reservoir. An air purifier works by circulating air through its internal filtration. Airborne irritants like dust, mold, pollen, smoke to the extent of germs will be trapped by the filter. On the other hand, dehumidifier works by sucking out moisture from the air. This would halt mold and other microbes growth as thrive on high humidity environment. Air purifier and dehumidifier can relieve discomfort from allergic reactions. This includes cough, sinus, itchiness, headache or breathing problems. The difference with a dehumidifier is more restricted to mold and microbes allergies. Air purifier can target a boarder range of indoor allergies.

Air purifier can be placed anywhere indoor but bedroom and living hall is the popular spot. Dehumidifier is often placed in the basement due to poor ventilation and no sunlight. Both appliances are suitable for all age group from newborn, baby, children, to adult. Noise level favors air purifier more as dehumidifier’s motor fan noise can be intrusive on higher speed. Price point is also similar at lower-end category but the gap widens for higher-end models. Air purifier calling the higher shot because of the complexity filtration and features.

The Difference between Air Purifier and Dehumidifier

Air Purifier


Varies from compact, tower, portable, and console.Generally mid to large framework to accommodate the reservoir.
Circulates air and trap airborne particles within its surrounding.Trap moisture while at the same time stop mold and other microorganisms from growth.
Health Benefits
Stop airborne contaminants from spreading and aggravating health conditions like Sinusitis, Pulmonary Edema, Asthma, or other respiratory issues.Alleviate running nose, cough, headache and prevent respiratory and breathing problems that is likely associated with mold illness.
Does not affect the room humidity.Decrease room humidity.
Best Used
Bedroom, living hall, kitchen or places with poor air quality.Basement, living hall or bedroom where high dampness and musty smell is an issue.
• Mechanical (HEPA)  • Activated carbon/ Deodorizer  • UV-light/ Ultraviolet  • PCO cleaner  • Ionic/ Ionizer  • Electrostatic  • Ozone generator• Mechanical or refrigeration  •Absorption/ Electronic desiccant  • Thermoelectric  • Ionic membrane
Target Group
Newborn, baby, children, adult, and elderly.Newborn, baby, children, adult, and elderly.
Noise Level
Subtle to loud.Subtle to very loud.
Cost with Upkeeping
Compact model start from $20 to $150. Medium-sized air purifier priced between $200–400. Anything above that would likely land you a large-sized air purifier.Price start from $30 to $50 for the “mini” renewable version. A mechanical dehumidifier is between $100–300.

Do I Need an Air Purifier or a Dehumidifier?

Get an air purifier if you are allergic to dust, mold, pollen, pet dander, germs, and the list goes on. Works well for smoke particles coming from cigarette, cooking, or chemicals if you have carbon filter installed. Get a dehumidifier if the air feels damp with a hint of musty smell (mold is here). If you have hygrometer/ humidity meter at home, you can keep track when humidity level goes beyond 50%. Summer is also a good time to get one.

Frequently Asked Questions FAQ

Can You Use a Dehumidifier and Air Purifier In The Same Room?

Yes and on high humidity environment, it's even better to do so. The reason both devices can coexisting together is because they function differently. An air purifier with HEPA filter would pull in and capture surrounding airborne contaminants. This includes hair, dust mites, mold, pollen, pet dander, bacteria, and viruses. Dehumidifier on the other hand, drains out the moisture in the air that is needed by microbes to expand. Without the ideal condition, microorganisms like mold will NOT thrive and prosper.