We recommend running air purifiers 24/7 on their highest “quiet” setting—usually medium—or leaving them on their auto mode if they have that feature. On an auto setting, they'll self-adjust the fan speed to address any changes in your air quality.
Therefore, we always recommend that you keep your air purifier running around the clock on at least the lowest speed (higher is better). Our air purifiers and filters are designed with constant use in mind, so you can rest easy knowing that your air is clean all the time.
We recommend elevating it no higher than 5 feet off the ground, and this can be done by placing the air purifier on a piece of furniture, such as a dresser.
It is recommended to run your air purifier continuously for optimal air purification and to maintain clean air quality. Running the air purifier non-stop ensures consistent filtration and effectively helps remove airborne pollutants and odors.
AHAM's guidelines state that the CADR be at least two-thirds of the room size. Therefore, to filter the air in a 200-square-foot area of your home, you'll need an air purifier with a CADR of at least 133 CFM, as 200 times 2/3 equals 133.
The higher the AQI value, the greater the level of air pollution and the greater the health concern. For example, an AQI value of 50 or below represents good air quality, while an AQI value over 300 represents hazardous air quality.
Length of time to leave it on
This is why most manufacturers will recommend you to leave your air purifier running all day, especially if it comes equipped with an automatic setting.
Regardless of where you live, the good news is, air purifiers do not use a lot of electricity to operate.
Are there any times you shouldn't run your air purifier? It's advised to keep your air purifier turned on all day and night, even when you're sleeping or not at home.
Air purifiers can clean a room within 20-45 minutes, with the time depending on the room's size, the purifier's power, and the initial air quality. For best results, choose a purifier suited to your room's size and maintain it well.
To test a whole-home air purifier, you must make the space smell. Cook the smelliest food you can think of, let the wet dog indoors, or burn potent incense that produces a noticeable odor. Then, turn the HVAC system fan on and notice as the odor dissipates. That is proof the air purifier is working.
When an efficient, effective, safe unit is selected, whole house air purifiers: Offer air purification without “boundaries” – they clean the air in your entire home. Eliminate the need for multiple air purifiers around the house. Provide air purification without taking up space in the living area of the house.
Ensure your air purifier has enough clearance around it to function optimally. Avoid placing it behind furniture or in tight corners where airflow might be restricted. Ideally, there should be at least 3-5 feet of clear space around the unit to allow for unimpeded air intake and output.
Higher fan speeds circulate more air, increasing the purifier's effectiveness. Faster-moving air causes airborne pollutants to float, making it easier for the air purifier to trap them. However, extreme speeds can hinder the purifier's efficiency. In smaller spaces, slower fan speeds are more suitable.
That's why, if noise is not a concern, systems should be operated on the highest speed setting for all hours that a room is occupied. For general air cleaning purposes, the system should filter the room air volume at least twice every hour on the set fan speed in order to achieve a significant air quality improvement.
What are the downsides of air purifiers? There aren't a lot of downsides to having an air purifier in your home aside from the financial investment. Many ionizers, especially older models, can generate ozone when they are operating, which is known to exacerbate asthma.
Keep your purifier running
We recommend running air purifiers 24/7 on their highest “quiet” setting—usually medium—or leaving them on their auto mode if they have that feature.
The energy cost of running an air purifier continuously is surprisingly low. Even a powerful whole house air purifier that covers up to 4,000 sq. ft. can cost just $0.27 a day, and that's when run continuously on the highest setting.
Air purifiers assist in eliminating household dust by helping to clean and purify the air in the home. Dyson's advanced purification machines are engineered with technology that traps dust before it settles on your furniture and floors. Dyson purifiers capture 99.95% of dust and ultrafine particles1.
Mold is an obvious health risk in any home, but investing in an air purifier can help limit your exposure. The best among them will ideally offer HEPA-level filtration, with this level of filtration being able to trap up to 99.97% of airborne particles down to 0.3 microns in diameter.
Heating and cooling: 45-50%
The largest electricity consumer in the average household is your heating and cooling appliance. By a long shot. Central air conditioners and heaters use tons of energy in order to keep your home set to the right temperature.
Specialists recommend placing the device on the floor, because it is near the ground that there is a higher concentration of pollutants. Setting it on a shelf can significantly reduce the filtration efficiency. An important issue is also where not to place the air purifier.
Is It Safe to Leave an Air Purifier On While You're Away? Leaving an air purifier on while you're away from home is generally considered safe, as most modern air purifiers are designed for continuous operation.