How Many Air Purifiers Do I Need? Make your Home Blissful

Our thoughts: As someone who values clean, breathable air, We’ve come to the conclusion that having an air purifier for each room in your home is the most effective way to ensure optimal indoor air quality. This verdict is based on thorough research and consideration of factors such as room size, air quality, and the specific needs of the occupants. While it may seem like an investment, the health benefits of breathing cleaner air are immeasurable. So, whether you live in a small apartment or a large house, my recommendation is clear: equip each room with an air purifier for the best results.

A common question arises: “How many air purifiers do I need?” This article aims to provide a comprehensive answer to this question. Air quality is a crucial aspect of our living environment that directly impacts our health and well-being.

While we often worry about outdoor pollution, studies from the Environmental Protection Agency (EPA) reveal that indoor air may be two to five times more polluted than outdoors. This is where air purifiers come into play. They clean stagnant indoor air by filtering out airborne particulates known to cause eye and lung irritation, trigger allergies, and other adverse health impacts.

The Importance of Size

The Importance of Size of Air Purifiers

When selecting an air purifier, size refers not only to the physical dimensions of the device but also to its ability to clean the air in a particular space. This capacity is typically measured in square footage and is one of the most important factors to consider when choosing an air purifier.

The size of the air purifier you need depends on the size of the room or space where you plan to use it. If the air purifier is too small for the room, it won’t be able to effectively clean the air, leaving you exposed to potential allergens and pollutants. On the other hand, an air purifier that’s too large for a room might result in unnecessary energy consumption and costs.

Factors Determining the Number of Air Purifiers Needed

If you need to figure out how many air purifiers to use in a space, such as a small apartment or a large house, there are a few things to keep in mind. These factors will affect how well the air purifiers work, as well as how efficient and cost-effective they are.

Occupants Health

The health of the occupants is a significant factor. If someone in your home has allergies, asthma, or other respiratory conditions, you might need more air purifiers to ensure the air is as clean as possible. This is especially true in bedrooms, where people spend a large portion of their time and need to breathe clean air to ensure a good night’s sleep.

Air Purifier Capacity

Air purifiers work by drawing in air from the room, passing it through a series of filters to remove different types of pollutants, and then releasing the clean air back into the room. The size of the air purifier determines how much air it can process in a given amount of time. This is often referred to as the air purifier’s Clean Air Delivery Rate (CADR), which measures the volume of clean air that an air purifier can deliver per minute.

The CADR is an essential factor to consider when determining the size of the air purifier you need. For example, if you have a large open-plan living area, you’ll need an air purifier with a high CADR to clean the air in the entire space effectively. Conversely, for a small bedroom, an air purifier with a lower CADR would be sufficient.

The below table provides a general guideline for the CADR (Clean Air Delivery Rate) needed based on the size of the room. CADR, measured in cubic feet per minute (cfm), indicates the volume of clean air that an air purifier can deliver.

The larger the room, the higher the CADR needed for effective air purification. It’s important to note that these are approximate values, and actual needs may vary based on specific air quality conditions and the air purifier’s efficiency.

Minimum CADR (cfm)Room Area (sq ft)

Air Change Per Hour (ACH) Rate

Remembering the Air Change Per Hour (ACH) rate when selecting an air purifier is essential. This measures how many times the air purifier can fully clean the air volume in a room within one hour.

For example, an ACH rate of 4 means the air purifier can clean the entire air volume in the room four times an hour. The recommended ACH for the cleanest indoor air is 4, but people with severe allergies or respiratory issues may benefit from a higher ACH rate.

Purpose of the Room

The purpose of the room also plays a role. Rooms where people spend a lot of time, like living rooms and bedrooms, might need more air purifiers than rooms that are used less frequently. Similarly, rooms that are more likely to contain pollutants, like kitchens (cooking fumes) and bathrooms (mold spores), might also need more air purifiers.


Your budget will also determine the number of air purifiers you can afford. Air purifiers can range in price from around $50 for small, basic models to over $500 for high-capacity, high-tech models. Therefore, you’ll need to balance the number of air purifiers you need with how much you’re willing and able to spend.

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Whole House vs. Portable Air Purifiers

Whole House vs Portable Air Purifiers

There are two main types of air purifiers: whole-house air purifiers and portable air purifiers. Whole-house air purifiers are integrated into the HVAC system of a house and clean the air as it circulates throughout the home.

These systems can be effective at improving the overall air quality in a house, especially if there are general air quality issues, such as high levels of dust or allergens.

On the other hand, portable air purifiers are standalone devices that are designed to clean the air in a single room or a specific area. These units can be moved from room to room and are typically used in spaces where people spend the most time, such as bedrooms or living rooms.

They can also be used in areas with specific air quality issues, such as a kitchen where cooking fumes are a concern or a basement that has a problem with dampness and mold.

Special Considerations for Specific Needs

Different environments and personal circumstances necessitate a closer look at air purification. While a standard air purifier might be sufficient for the average home, specific situations demand tailored solutions to ensure optimal air quality.

Allergies and Asthma Triggers

Individuals who suffer from allergies or asthma have heightened sensitivities to certain airborne particles. Pollen, mold spores, and dust mites can exacerbate symptoms, making air purification vital.

For such scenarios, a purifier with a HEPA (High Efficiency Particulate Air) filter becomes indispensable. These filters can capture up to 99.97% of particles 0.3 microns in diameter, providing relief from common allergens.

Homes with Pets

Our furry companions bring joy and comfort but also introduce pet dander, hair, and odors into the household. Air purifiers tailored for homes with pets often feature multi-stage filtration, including activated carbon layers to combat odors and HEPA filters to trap dander and hair, ensuring the environment remains pleasant and allergen-free.

Areas with High Pollution or Smoke Exposure

Residences in urban centers or near industrial zones confront unique challenges, with external pollutants like smog, volatile organic compounds (VOCs), and particulate matter posing risks.

In areas prone to wildfires, smoke becomes an added concern. Purifiers equipped with activated carbon filters excel in such situations, as they can absorb gases, odors, and VOCs, offering a sanctuary amidst the haze.

Regions with High Humidity

Humid environments are a breeding ground for mold and mildew. These fungi release spores that can impact health and degrade indoor air quality. For damp regions or homes with poor ventilation, dehumidifiers paired with air purifiers that target mold spores become essential.

Spaces with Frequent Renovations or New Furniture

Frequent home renovations or new furniture can introduce chemicals like formaldehyde, benzene, and other VOCs. These compounds emanate from paints, solvents, and pressed wood products. An air purifier with enhanced capability to neutralize VOCs can be instrumental in maintaining a toxin-free environment during and after renovations.


Maintaining optimal indoor air quality is important, and choosing the right air purifier can help. To make it easier, the provided table shows the recommended Clean Air Delivery Rate (CADR) based on the size of the room.

It’s important to choose an air purifier with a CADR that matches the minimum value recommended for your room size. For example, a 450 square foot room requires an air purifier with a CADR of at least 300 cubic feet per minute. Following these guidelines will ensure efficient air filtration that’s tailored to your specific space.

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