How many Air purifiers do I need?

How Many Air Purifiers Do I Need

In an age where clean air is not just a luxury but a necessity, air purifiers have emerged as vital allies in our quest for healthier living spaces. These devices work tirelessly to remove contaminants, allergens, and pollutants, ensuring that every breath we take is as pure as possible. But a common question arises: How many air purifiers are truly needed for a space?

This article aims to shed light on How Many Air Purifiers Do I Need ?

Do You Need An Air Purifier In Every Room ?

Do You Need An Air Purifier In Every Room?

The decision to place an air purifier in every room of your home depends on various factors, including the specific needs of the occupants, the layout of the house, and the overall air quality. Here’s a breakdown to help you make an informed decision:

Purpose of the Air Purifier: If you’re looking to address a specific concern, such as allergies, it might be more beneficial to have an air purifier in rooms where the affected individual spends the most time, like the bedroom or living room.

Size and Layout of the Home: Open floor plans might allow for effective air circulation with fewer purifiers, while homes with many separate rooms or multiple floors might benefit from having individual units in key areas.

Air Quality Concerns: If certain rooms have more significant air quality issues, like a basement prone to mold or a room where someone smokes, it’s advisable to have a dedicated purifier in those spaces.

Cost and Maintenance: While having an air purifier in every room ensures optimal air quality, it also means higher initial costs and more maintenance in terms of filter replacements.

Mobility of the Unit: Some air purifiers are designed to be portable. If you have such a unit, you can move it from one room to another based on your needs, reducing the necessity for multiple devices.

Presence of Specific Pollutants: Rooms with higher activities, such as kitchens (cooking fumes) or rooms with pets, might have different air quality needs compared to a study or a bedroom.

Calculate How many Air purifiers do I need

Determining the number of air purifiers required for your space involves understanding the capacity of the purifier and the specific needs of the room. Here’s a step-by-step guide to help you calculate:

Determine the Room’s Size: Measure the length and width of the room and multiply them to get the total square footage (or square meters). For example, a room that’s 10 feet by 15 feet is 150 square feet.

Check the CADR Rating: CADR (Clean Air Delivery Rate) is a standard measure for an air purifier’s efficiency in terms of cubic feet (or meters) per minute. This rating tells you how quickly the purifier can clean the air in a specific-sized room. A higher CADR means the purifier can handle larger rooms.

Factor in Ceiling Height: If your room has a particularly high ceiling, you might need to adjust your calculations. A standard room height is usually considered to be 8 feet. If your room’s ceiling is higher, calculate the volume (length x width x height) and compare it with the purifier’s recommended volume capacity.

Consider Specific Needs: If the room has smokers, pets, or is particularly prone to allergens, you might need a purifier with a higher CADR or even an additional unit.

How Many Air Purifiers Do You Need?

To determine the number of air purifiers you need for your home, consider both the size of the space and the efficiency of the purifier. Here’s a basic formula to help you calculate:

No. of Air Purifiers

For instance, for a 1,000 sq ft home with an 8 ft ceiling:

No. of Air Purifiers

This means for a home of this size, you’d need about 2 to 3 purifiers.

Air Purifiers Needed for Different Home Sizes

Home Size (sq ft)No. of Air Purifiers (for 8 ft ceiling and 200 CFM)
Up to 8001
800 – 16002-3
1600 – 24003-4
2400 and above4+


  1. Air Changes Per Hour (ACH): The recommended rate for clean indoor air is 4 ACH. This means all the air in the space is replaced 4 times an hour. To achieve this, you might need more purifiers.
  2. Ceiling Height: The above table assumes an 8 ft ceiling height. If your ceilings are higher or have vaulted spaces, you may require additional capacity.
  3. Air Purifier Efficiency: Different brands and models have varied efficiency. Ensure you check the specifications before deciding.

Our Recommendations:

  1. For Smaller Homes (Up to 800 sq ft): One high-quality air purifier should suffice.
  2. Medium-sized Homes (800 – 1600 sq ft): Opt for 2 to 3 units, preferably placing them in rooms where you spend the most time, like the living room, bedroom, or kitchen.
  3. Larger Homes (1600 sq ft and above): Consider having 3 or more units. Strategically place them in different sections of the house for uniform air cleaning.
  4. For the Cleanest Air: Aim for the recommended 4 ACH. It might mean investing in more units, but for those especially concerned about air quality, it’s a worthy investment.

Remember, top brands like Coway, Honeywell, Winix, IQAir, Levoit, Hathaspace, and Alen BreatheSmart design their units keeping these standards in mind. Always check the specifications and consider combining different units for the best results.

Coverage AreaAir Changes Per Hour (ACH)Number Of Air Purifiers Needed
800 sq ft42
800 sq ft21
800 sq ft11
1,200 sq ft43
1,200 sq ft22
1,200 sq ft11
1,600 sq ft44
1,600 sq ft22
1,600 sq ft11
2,000 sq ft45
2,000 sq ft23
2,000 sq ft12
2,400 sq ft46
2,400 sq ft23
2,400 sq ft12
2,800 sq ft47
2,800 sq ft24
2,800 sq ft12
3,200 sq ft48
3,200 sq ft24
3,200 sq ft12


The number of air purifiers you require largely depends on the size of your home and the efficiency of the chosen purifier. For optimal air quality, especially in larger homes, multiple units may be necessary.

  • Homes up to 800 sq ft: 1 air purifier.
  • Homes between 800 to 1600 sq ft: 2 to 3 air purifiers.
  • Homes larger than 1600 sq ft: 3 or more units.

Factors like ceiling height, room configuration, and the purifier’s specifications also play a role in this decision. Ultimately, for the best indoor air quality, aiming for a rate of 4 Air Changes Per Hour (ACH) is recommended, which might necessitate additional units. Always consult specific product details and consider placing purifiers in frequently used rooms for maximum effectiveness.


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Can a massage chair replace physical therapy for sciatica?

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Do all massage chairs effectively address sciatica pain?

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The author is an Air purifier expert with overall knowledge of air and ionizers.