Air purifiers need to be turned on for a good chunk of time to improve indoor air quality, but it can be tricky to know whether you should leave your air purifier on all the time to get the most out of it. On the one hand, you want to breathe clean air consistently inside your homes, but on the other hand, you don't want your energy bills to be sky-high.
We asked the experts and the consensus is that while it is preferable to leave an air purifier running around the clock, it's not essential if you're concerned about running costs. Also, many of the best air purifiers now have an auto mode, so they switch themselves off when the air quality has reached a good enough level.
