Honeywell Protec Treated Antimicrobial A Size Humidifier Filter

Last updated date: January 10, 2022

DWYM Score

9.0

Honeywell Protec Treated Antimicrobial A Size Humidifier Filter

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We looked at the top Humidifier Filters and dug through the reviews from some of the most popular review sites. Through this analysis, we've determined the best Humidifier Filter you should buy.

Update as February 7, 2022:
Checkout The Best Humidifier Filters for a detailed review of all the top humidifier filters.

Overall Take


In our analysis, the Honeywell Honeywell Protec Treated Antimicrobial A Size Humidifier Filter placed 6th when we looked at the top 6 products in the category. For the full ranking, see below.

From The Manufacturer

HONEYWELL HUMIDIFIER REPLACEMENT FILTER: Replacement humidifier wicking filters use a patented design that helps inhibit 99.99% of growth and migration of particles on the filter. A blue pre-filter layer helps capture large particles. WORKS WITH: The Honeywell “A” wicking filters (HAC504) include a blue pre filter that capture large particles; They work with Evaporative Honeywell Humidifiers in the HCM-350, HEV355, HCM-710 and HCM-315/HEV312 Model Series. COUGH AND CONGESTION RELIEF: Humidifiers for the home can be helpful during cold and flu season, when it’s difficult to sleep with a cough and congestion; A humidifier or vaporizer can provide temporary relief by adding necessary moisture to the air. COMPATIBLE DOES NOT MEAN COMPARABLE: For best performance, use only these Genuine Honeywell humidifier filters; Compatible humidifier filter replacements are not certified to offer the same performance or efficiency.

Expert Reviews

User Summarized Score

9.5
6,270 user reviews

What experts liked

Works well. Lasts longer than generic versions. Kills 99.99% of mold, algae and bacterial growth. Treated with an antimicrobial layer.
- Baby Bargains

What experts didn't like

Pricey.
- Baby Bargains

An Overview On Humidifier Filters

Humidifiers add moisture to the air using water to help you breathe better. The filters inside them remove minerals and other pollutants from that water, helping to prevent mold, bacteria and algae growth and migration.

Most humidifiers you see today use cool mist ultrasonic technology, which uses ultrasonic sound vibrations. Regular cool mist humidifiers use high-speed rotating disks. But matter what kind you have, the EPA recommends cleaning it every third day.

Humidifiers cannot do their jobs without clean, working filters. These inexpensive, replaceable filters can be made from clay, paper and metal, holding water as the air blows across their antimicrobial coatings. During this process, mineral deposits and impurities get removed, and the coating prevents the growth of bacteria, viruses and mold from growing on the filter.

These filters do not have expiration dates on their packages, but they will last no more than three to four months once you start using them. Filters become clogged and brittle over time and eventually cannot hold water. They can also become contaminated by impurities from the water.

That is why it is so important to change them at the start of every heating season when they are in use. You might even want to do it more often if the air in your house is especially dry.

When it comes time to replace your humidifier filters, you will have to find ones that fit with your brand and model. One manufacturer might make several humidifier models, so you’ll have to look at yours for this information. Other companies make compatible humidifier filters that might be usable with yours, but read the product reviews to check what others have to say.

The Humidifier Filter Buying Guide

  • Hard water can degrade humidifier filters. Unless your humidifier’s package reads differently, filtered or distilled water is best for most models.
  • To clean the humidifier, empty the tank and wipe all surfaces dry with a clean microfiber cloth.
  • Some humidifier filters can discolor slightly over time, and this is normal.
  • Humidifier filters may need to be soaked in water before using.
  • Set a reminder to replace your humidifier filter every three to four months.
  • Never pour essential oils into humidifier water tanks.