What size air purifier do i need for a bedroom?

What size air purifier do i need for a bedroom?

When it comes to creating a clean and healthy indoor environment, air purifiers play a crucial role. Bedrooms, being spaces where we spend a significant amount of time, should have adequate air purification to promote better sleep and overall well-being. In this evaluation article, we will explore the factors to consider when determining the size of an air purifier for a bedroom. By understanding these factors and making an informed decision, you can choose the right size air purifier to effectively clean the air in your bedroom and create a more comfortable living space.

Assessing the Square Footage of Your Bedroom

The size of your bedroom is the primary factor in determining the appropriate size of an air purifier. Measure the length and width of your bedroom and multiply the two numbers to calculate the square footage. Most air purifiers come with a recommended coverage area, usually measured in square feet. It is important to choose an air purifier that can adequately cover the square footage of your bedroom to ensure effective air cleaning.

Determining the Air Changes per Hour (ACH) Requirement

Air changes per hour (ACH) refer to the number of times an air purifier can filter the entire volume of air in a room within one hour. Bedrooms typically require 4 to 6 ACH for optimal air purification. To determine the ACH requirement for your bedroom, multiply the square footage by the height of the room to calculate the room volume. Then, divide the volume by the air purifier's CADR (Clean Air Delivery Rate) to estimate the number of air changes per hour. Aim for a minimum of 4 ACH to ensure effective purification of the air in your bedroom.

Considering the Clean Air Delivery Rate (CADR)

CADR is a metric that indicates the air purifier's effectiveness in removing pollutants such as dust, pollen, and smoke. Look for air purifiers with higher CADR ratings, as they can provide more efficient air cleaning. The Association of Home Appliance Manufacturers (AHAM) recommends a CADR rating of at least two-thirds the room's square footage. For example, if your bedroom is 200 square feet, aim for a CADR rating of around 133 or higher.

Noise Level Considerations

Bedrooms should be a place of rest and tranquility, so it's essential to consider the noise level of the air purifier. Check the product specifications for the decibel (dB) rating of the air purifier at different fan speeds. Look for models that operate quietly, especially during nighttime, to ensure uninterrupted sleep and minimal disturbance.

Additional Features and Considerations

While size and coverage are crucial factors, other features and considerations can enhance your air purifier experience. Look for features such as multiple fan speeds, programmable timers, air quality sensors, and filter replacement indicators. These features can offer convenience and customization options based on your specific needs and preferences.


Choosing the right size air purifier for your bedroom is essential to create a clean and healthy indoor environment conducive to restful sleep and overall well-being. Consider the square footage of your bedroom, determine the ACH requirement, and select an air purifier with an appropriate CADR rating. Additionally, take into account the noise level and consider additional features that align with your preferences. Take control of your indoor air quality and prioritize your health by selecting the ideal air purifier for your bedroom today.