Why Is My Costco Air Purifier Quality Light Yellow?

The Costco sale is something a lot of us wait for eagerly. Those of us who even buy important home appliances, how often do we check whether we got our money’s worth or not?

For example, air purifiers are an absolute necessity during this age of global warming and excessive air pollution. But before buying, you need to decide on a brand. Question is, what if you choose the wrong product?

I faced this dilemma myself, especially when the quality light flashed yellow. So, why is my Costco air purifier quality light yellow? Don’t worry, it is the only indicator that your filter needs changing!

Quality Indicator Lights

Every air purifier comes with quality indicator lights. They are programmed to inform you about the air quality around you and also remind you to change or buy a new filter. Generally, there are three to four levels, with different colors of lights.

Why Your Costco Air Purifier Quality Light Is Shown Yellow

No matter what brand you buy from Costco, the air purifier will have indicator lights, and the advanced ones will have a supporting app to install on your mobile phones.

In most cases, the shades between blue and green in the color wheel are used to indicate decent air purifying quality. In other words, your air purifier is doing a good job of making your surroundings healthy.

If the color gradually changes to yellow, it means your air purifier is going to need a new filter soon. If the light is somewhere between orange to red, it means the air purifier has reached its limits, and you need to change the filter immediately.

So, if you’re a tech-savvy person, then you can always choose to buy an air purifier with smartphone settings. That, along with the already built-in lights, helps to keep a close watch on your household appliance. Otherwise, choose one that only has lights as an indicator.

If you live in a place susceptible to air pollution, your purifier is likely to show the yellow light more often as it has to deal with more dust particles, humidity, allergens, mold, and viruses than average.

Tips for Maintenance

  • Wash the washable filters at least every week or month, depending on pollution levels.
  • Place the air purifier preferably in a corner of your room and out of reach if you have toddlers.
  • Keep your air purifier away from direct sunlight and water.

Choosing the Right Product

Here’s a short list of things you need to consider before buying the right air purifier.

  • Make sure that the mentioned unit area the purifier can cover matches your room size.
  • Go for the ones with at least three filters one of which is an activated carbon filter. This technology prevents air-borne disease.
  • Sound level is an important factor to consider, along with size.
  • It’s always a good idea to buy a product with a warranty.


Hope you got your answer now. If you are still confused about why your Costco air purifier quality light is shown yellow, it’s time to contact an expert, preferably from the same brand/company your purifier comes from.

Last Updated on January 5, 2023

Richard Hicks

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