Which one is better? Well, that is a debatable topic. Dehumidifiers and air purifiers have their own uses and functions. Depending on the situation, one may be better than the other.

However, just because they’re used for different things doesn’t mean you can’t use both at the same time! In this article, we will discuss how these 2 appliances are different, and how they work.

Basic Functions of Each Device

At its simplest form, a dehumidifier is an appliance that reduces the level of humidity in the air. On the other hand, an air purifier or cleaner removes pollutants from your environment. Thus, the main function of both appliances is to lower humidity and reduce pollutants respectively.

What is a dehumidifier?

A dehumidifier is an appliance used to remove humidity or moisture from the air (inside your home). It has a compressor, fan blades, and coils that absorb water vapor out of the surrounding air. By removing excessive amounts of water vapor, it helps reduce the humidity level in a room.

It is to be noted that when the humidity in a room is too high, dust mites will flourish. This can cause allergies and other respiratory problems. Moreover, a dehumidifier also helps prevent mold from growing inside your home or office.

A dehumidifier’s function is to reduce the humidity level of a room so it can be comfortable to breathe in. It’s not meant to completely eliminate humidity, just reduce it so that the air feels less warm and moist.

How does a dehumidifier work?

A dehumidifier absorbs moisture from the air by cooling the coils with the help of its fan blades. The coils are placed in an enclosed cabinet, where it cools down and condenses water vapor. The water is then collected at the bottom of the device so that you can easily dispose of it.

Types of Dehumidifiers

The main difference in a dehumidifier is where it needs to be used. The majority of home dehumidifiers are designed for use inside your home, but there are certain models that can only be used outside. For example, a stand-alone swamp cooler or outdoor fridge would be an example of a dehumidifier meant for outdoor use. A dehumidifier with a pump is made mainly for the purpose of extracting water from appliances like freezers and AC units.

A dehumidifier can also be used to remove excess moisture from items such as guitars, paintings, and other valuable artifacts. Especially if you live in a place where humidity levels are high (like Florida or Louisiana), it’s best to use an appliance that can control humidity.

What is an air purifier?

An air purifier, on the other hand, has a HEPA filter that captures particles and allergens from the surrounding air. It works by forcing clean air through a machine-washable pre-filter and an ultra-fine post filter. As a result, clean air is pushed back into your room. However, this doesn’t mean there is no water vapor around; it just means the air purifier has removed most of the impurities from the surrounding air – including dust and dirt.

How does an air purifier work?

The first step of their function is to remove larger particles like dust and dirt with the help of a pre-filter (with your standard air purifiers). After that, it goes on to clean the air via the HEPA filter bypassing dry, clean air through it multiple times before output. This helps remove air impurities that are 0.3‑micron in size, including allergens like pollen, smoke, pet dander, mold spores, dust mites, etc.

Types of Air Purifiers

Air purifiers come in a large variety of shapes, sizes, and power. There are small models that can fit on your tabletop. Others are larger-sized devices meant to be placed in the corner of the room. They also have different speeds and functions depending on what you need them for or how much air you want to flow into your room.

Just like dehumidifiers, there are also different types of air appliances: ionizers, germicidal UV lamps, and electronic air cleaners. Air purifiers and cleaners with a HEPA (high-efficiency particulate arrestor) filter will remove airborne pollutants down to 0.3 microns in size. Aside from this type, other air purifiers only have an activated carbon filter which will remove gases and odors, but not pollen or dust.

Air cleaners with a HEPA filter are the most common because it is able to capture airborne pollutants down to 0.3 microns in size. It’s also easy to maintain since you can simply wash the pre-filter every few weeks. The downside to this is that it may overheat if used for too long, so it’s best to only turn on its fan for about three hours at a time.

Now that you know what each appliance does, let’s look at which one would be better for certain situations:

  1. Which is better for a baby?

Although it may not seem too important to have clean air when you’re just at home, having an air purifier can help prevent the growth of bacteria and fungi in your home – especially if you have little ones running around! This is because babies or kids are more sensitive to their surrounding environment. Not only are they more likely to have allergies, but their little bodies can’t take in harmful pollutants and allergens as well.

Thus, you should opt for an air purifier over a dehumidifier, especially if your baby or kid is sensitive to their surrounding environment or has asthma.

  1. Which is better at home?

If you’re looking for appliances that can do both functions, then you’ll need to invest in an air purifier that also has a dehumidification function! Although they’re pricey, investing in one will help control the humidity levels in your home as well as remove impurities from the surrounding air.

However, if all of these seem too pricey for you, then a dehumidifier is just right for you. Although it doesn’t have the ability to neutralize allergens in your home, it has a more affordable price point and can maintain a comfortable level of humidity by removing excess amounts of water vapor from the air.

  1. Which is better at work?

If you’re working in an office, then you probably spend the majority of your day indoors. Thus, it is important to keep your surrounding environment clean in order to avoid catching any diseases or bacteria that may be in the air.

On the other hand, only having a dehumidifier at work can lead to damage within your electronic appliances due to the high levels of humidity. Thus, an air purifier would be more ideal to help purify the air in your office.

What Can You Use Both Devices For?

Most of the time, you would use either a dehumidifier or an air purifier for one thing at a time, but there are some appliances that can be used for both purposes. For instance, you can use your dehumidifier to eliminate dust particles in the air and help remove allergens from the room. Likewise, you can also use an air purifier to control humidity levels and provide comfort within a room.

However, if you want to save space and money, then a multi-functional appliance that does both jobs is what you should invest in.


Ultimately, both the dehumidifier and air purifier are essential appliances for your home. They’re good investments that will keep you healthy! If you’re still confused about which appliance to get, then opt for a dehumidifier first. Then, invest in an air purifier if you find that it is necessary.

Regarding the difference between a dehumidifier and an air purifier, we hope this article has helped clear up any ambiguities about their functions.