What Size Air Purifier Do I Need?

This article will help you figure out what size air purifier you need and why it is important to choose the right size for the right space.

Have you recently gotten into the idea of purchasing an air purifier? You’ve heard of the many health benefits and want to own one of these amazing devices that improve indoor air quality. But before purchasing one you may have found yourself wondering what size air purifier you may need. Of course, this will depend on various factors. Read on to learn how to figure out the ideal air purifier size for your needs. 

Air Purifier Sizes

Before we discuss the size you need your air purifier to be, it is important to go through all the air purifier sizes so you can have a better understanding of what you’re looking for. There are four main categories, each ideal for a specific room size. 

  1. Small air purifier: effective for rooms up to 200 square feet and personal spaces
  2. Medium air purifier: effective for rooms from 200 to 400 square feet
  3. Large air purifier: effective for rooms from 400 to 1,500 square feet
  4. Air purifier for the whole house: effective for purifying every room of the house 

What Size Air Purifier Do I Need?


So now that you know all the four air purifier sizes and their square feet capacity, you want to find out the exact size you need. Choosing the right size air purifier is very important, as it will have an impact on the efficiency and effectiveness of this device and implications on your monthly expenses. Now that we know why it is important to choose the right size,  let’s take a look at how to do that.

1. Choose the room you want to put it in

The first easy step you need to take before you purchase an air purifier is to decide what room you want to put the air purifier in. Do you need an air purifier for a single room, a few rooms, or for the entire house? Whichever the answer to that question is, it will most definitely make the decision easier in terms of comparing air purifiers.

2. Measure the square footage of the room

Once you have decided where you would like to use the air purifier, it’s time to find out the square footage of that area. Whether you want to measure a single room, multiple rooms, or the entire house, we can help.

  • If you want to measure a single room: this is the easiest one. All you have to do is get some measuring tape and take measurements of the two perpendicular walls of the room. This will help you find the square footage of a single room.
  • If you want to measure multiple rooms: take measurements of all the rooms separately and add the total of each. There you have it! 
  • If you want to measure the whole house: there are two options for figuring out your house’s square footage. The first one is to find the house plan, which will most definitely have the square feet written on it. If for some reason you don’t have the house plan, not to worry. All you need to do is go outside your house and measure the width and length of the outside walls of your house. After that, just multiply the number by the levels of your house. For example, if you calculated 1,500 square feet and your house has two levels, the total would be 3000 (1,500×2) square feet.

3. Match the square feet rating of the air purifier with the size of the room

There are many shapes, sizes, and models of air purifiers, and each has a maximum square feet capacity on its features. This means that the effectiveness of the device will depend on the size of the room. The best size of an air purifier is one that meets the square feet of your chosen area or even exceeds it; this will allow you to have an amazing experience with the device at its full capacity. You will generally be able to find out the capacity of the air purifier by checking the specifications.

4. Alternative method – using CADR

Another method you could use for choosing an air purifier is the CADR (Clean Air Delivery Rate) rating. This rating specifies how quickly an air purifier is capable of removing air contaminants such as pollen, smoke, and dust from the air of the room. An air purifier with higher CADR ratings is able to clean the air of the room faster than the models with a lower CADR rating. 

Can an Air Purifier Be Too Big or Too Small for a Room?


Yes, an air purifier most definitely can be too big or too small for a room. For instance, if you purchase an air purifier that is too big for a room, it will cost more in terms of requiring expensive filters, it will use a lot more energy than needed, and it will generally be more expensive to purchase. In brief, an air purifier that is bigger for your space than needed will make you waste money unnecessarily. 

On the other hand, if you purchase an air purifier that is way too small for your space is not going to be powerful enough to clean the air as effectively and efficiently as one with the perfect size. This would defeat the point of having an air purifier. If you, for example, would like to purify the air in your whole house but don’t want to invest in a large one, you can always consider purchasing smaller ones for each level of your house or apartment rooms. 

How Much Maintenance Does an Air Purifier Require?


Depending on the model and brand, some air purifiers can work for years without requiring a single check-up, but this doesn’t mean that they will work as effectively. Caring about one’s appliances is important to always consider in order to extend that device’s lifespan as much as possible. You can always turn to a professional for assistance; however, nowadays, many air purifiers come with smart features and an app that notifies you when is time to replace or clean their filters. 

The Bottom Line

In this case, we can say that size makes a big difference, and figuring out the right one is not that big of a deal: it will save you money and it will effectively contribute to your well-being. Remember that the benefits of having an air purifier are more than just breathing clean air, it also helps with mold and odors, and for those with allergies, this device can become your best friend in the spring. Air purifiers today are a great investment in health. Go get yours!

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