Tips for Choosing the Right Air Purifier Size for Your Room

Having clean air in your home is an important factor in promoting good health and overall wellbeing.

With so many air purifier options on the market, it can be tricky to find the right size for your needs. Knowing what size air purifier you should buy for your room is crucial when making a purchase.

In this article, we provide some useful tips to help you choose the best air purifier size for your space.

Choosing the Right Air Purifier Size

1. Calculate Room Size

When it comes to choosing an air purifier, it is crucial to know the size of your room. The size of the room will determine the type and size of the air purifier that you need.

The first step is to measure the length and width of your room using a measuring tape.

To calculate the square footage, multiply the length by width. For instance, if your room measures 10 feet by 12 feet, then your total square footage is 120 sq.ft.

Once you have determined your square footage, you can easily choose an air purifier that suits your needs.

A general rule of thumb is that an air purifier should have a CADR (clean air delivery rate) rating equal to or greater than two-thirds of your room’s square footage. So in our example above, you would want an air purifier with a CADR rating of at least 80.

In addition to the CADR rating, consider other factors such as noise level and filter replacement costs when selecting an air purifier for your room size.

2. Determine Air Quality Needs

This involves assessing the level of pollutants in your indoor environment and identifying the type of air purification system that will best address those pollutants. Understanding your needs will help you choose an air purifier with the appropriate size and capacity.

Factors such as room size, number of occupants, and presence of pets or smokers can affect indoor air quality. Allergens like dust mites, pet dander, and pollen can also contribute to poor indoor air quality.

If you have respiratory problems or allergies, then you should consider getting an air purifier specifically designed to remove these types of allergens from the air.

3. Choose a Quality Filter

Look for a HEPA (High-Efficiency Particulate Air) filter, which is designed to remove 99.97% of particles that are 0.3 microns or larger. This includes common allergens like dust mites, pollen and pet dander.

It’s also important to consider the type of filter used in the air purifier. Some models use activated carbon filters, which are effective at removing odors and volatile organic compounds (VOCs). However, these filters do not capture smaller particles like HEPA filters do.

Finally, make sure to check if replacement filters are readily available and affordable for the model you choose.

A high-quality air purifier with expensive replacement filters might not be worth investing in over time compared to a lower-priced model with easily replaceable filters.

Related: HEPA vs. Non-HEPA Filters in Air Purifiers

4. Consider Air Purifier Features

You also need to pay attention to the features that come with it.

Consider if your air purifier has additional features such as automatic shut-off or sleep mode when not in use.

Some models even come with remote control or Wi-Fi connectivity so you can adjust settings from your phone or tablet.

All these features contribute to a better overall user experience and more effective performance in keeping your indoor air clean and healthy.

5. Consider CADR Ratings

CADR (Clean Air Delivery Rate) is a rating system that measures the efficiency of an air purifier in filtering out airborne particles such as dust, pollen, and smoke.

The higher the CADR rating, the more effective the air purifier is at removing pollutants from the air. When choosing an air purifier for your room, it’s important to consider its CADR ratings as it directly impacts its performance.

The recommended CADR rating for an air purifier varies depending on the size of your room.

For example, a 200 square feet room requires an air purifier with a minimum CADR rating of 120 for smoke, 130 for pollen, and 140 for dust. If you have a larger room or if you want to filter out additional pollutants like mold or pet dander, you may need to choose a higher CADR rated air purifier.

Peace of Mind with Truly Clean Air with the TRACS Portable UV-C Air Purifier

6. Set Budget

One of the most important things to consider when choosing an air purifier for your space is setting a budget.

Air purifiers come in a range of sizes and prices, so it’s important to determine how much you’re willing to spend before making a purchase.

Keep in mind that more expensive models often come with additional features like smart technology or HEPA filters, which can be beneficial for those with allergies or respiratory issues.

When setting your budget, it’s also important to consider the size of your room. A smaller room may only require a smaller air purifier, while larger rooms may need a more powerful model.

Additionally, if you have pets or live in an area with high levels of pollution or allergens, you may want to invest in a higher-end model that can effectively remove these particles from the air.

Ultimately, setting a budget will help you narrow down your options and find an air purifier that meets both your needs and financial constraints. Be sure to do some research beforehand and read reviews from other users to ensure you’re getting the best value for your money.


In conclusion, choosing the right air purifier size for your room is crucial in ensuring clean and healthy air.

Remember to consider the size of your room, as well as any allergies or respiratory conditions you may have when making your selection. Also keep in mind that larger air purifiers are not always better; it’s important to find a unit with appropriate specifications for your specific needs.

Once you have determined the appropriate size for your air purifier, be sure to regularly maintain and replace filters as needed. This will ensure that your unit is functioning at optimal capacity and effectively removing pollutants from the air.

With proper care and consideration, an air purifier can greatly improve the overall quality of life in your home or office space by providing cleaner, fresher air for all who occupy it.

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