Can You Leave Air Purifier On All The Time

So you brought the latest and most powerful air purifier in the market. Everything looks great and the air is being filtered as we speak. Your allergy symptoms have gone and overall indoor air quality has improved. Yet, there is always the question that always has been lingering in your head. Am I suppose to leave the air purifier on all the time? Should I let it cool down to avoid overheating? What about the electricity cost? Will I be hit with a heavy bill?
Short answer
An air purifier is designed to run 24x7.

Should I Run an Air Purifier All Day?

An air purifier should be running all the time even when you are away for work or out of town. It is not possible for the room to remain clean with only a couple of hours of runtime. Leaving it on all day allows the air purifier to continuously draw air through the filters and circulate clean air. When the air purifier is turned off, it will stop filtering the air and harmful particles will gradually return within 2 to 4 hours. So when you turn it on the next day, it will take a longer period of time to completely clean the air in a room.

The best time to use an air purifier is when you are present in the same room, during haze or allergy season. It is also perfectly safe to run an air purifier all the time without having to worry it will breakdown, overheat, or catches on fire. It will not generate any toxic by-products like CO, or ozone. The most popular option is a HEPA air purifier that can be found in hospitals, offices, and nursery homes. Most models are equipped with a True HEPA filter that captures 99.97% of microscopic particles as small as 0.3 microns and a carbon filter that adsorb smoke and odor particles.

A dirty filter is less effective compared with a brand new filter. If you plan to run an air purifier day and night, it is important to check on the filter. As more pollutants will be trapped inside, the filter tends to wear out quicker so a more frequent filter change is needed. You should start changing the filter when it reaches its lifespan typically between 6 to 12 months. Follow the manufacturer’s instruction or when the filter change indicator is flashing. Consider having a standby replacement when the filters reach the end of the life cycle.

Can I Leave My Air Purifier on All Night?

You should sleep with an air purifier on to prevent pollutants from building up overnight. Allergens and germs do not take a break while you sleep. As we spend one-third of our time in bed, it doesn’t make sense that airborne irritants will go to bed the same time as you. Dust mite, mold spore, pollen, pet dander, bacteria, and viruses are easily spread through airborne and can disrupt your sleep by triggering an allergic reaction. With an air purifier consistently removing airborne contaminants while we are asleep, we will be at less risk breathing to the allergens and wake up feeling refresh the next day.

Will Air Purifier Use A Lot Of Electricity If I Leave It On All Day?

An air purifier is designed to run 24×7 safely and will use little energy especially if there are Energy Star Rated. Some well-known model has a power consumption rate equivalent to a light bulb. Even if you run it all day every day, you will not see a huge spike in your electric bills at the end of the month.

We do not recommend running an air cleaner intermittently in order to save costs on the electric bills. It is far from economical and you will be at risk of inhaling harmful contaminants. As air quality in your home will drop every time you turn off the device, the air cleaner will have to work extra hard to restore back the clean air. It may end up using more energy with a higher electricity bill than just leaving the air purifier on.

There are better ways to save money. To converse energy, start with the highest fan speed for 1-2 hours depending on the room coverage. Then switch to medium or low speed and leave the air purifier on throughout the day. That way when you’re back from work, you will be breathing straight fresh purified air. Alternatively, pick an energy-efficient air cleaner that comes with Auto mode and air quality sensor. The model will conserve energy by setting the fan speed to low and only use higher speed when a high level of pollutants is detected. This gives you the freedom and confidence to leave the air cleaner on the whole day. To calculate the running cost of an air purifier, multiply the energy consumption with the rate of electricity (by states) and hours of operation. For the monthly electricity bill, just multiple the cost by 30 days.

Should I Open Windows With An Air Purifier On?

Depend on the air quality outside but you should keep all windows shut to reduce the numbers of irritants from flowing in. Even if outdoor air is not polluted, Leaving windows open forces the air cleaner to restart the cleaning cycle as fresh air are coming in and out. Instead, vacuum regularly to keep your home clean and tidy. This would reduce the air purifier workload and maximize performance.



Max Fernandez

A loving father and a dedicated reviewer for airfuji.com with more than 1000 air purifiers under his belt. Max Fernandez is also one of the million patients currently suffering from asthma. Feel free to nudge him if you have any questions.