HEPA, Carbon, or Electrostatic Filter: Which to Use?

Filter words on dehumidifier listings

Dehumidifier listings print filter words such as HEPA, activated carbon, and electrostatic in the title or the bullet list. On this site, a filter word is read as a stated detail: the listing names a filter type, and the maker's page says what that filter does. A filter type is separate from the capacity group, the unit type, and the drain options, which the buying guides compare on stated details.

When a title names a filter, read the bullet list to see whether the filter is included with the unit or sold as a separate part. See dehumidifier filter types and maintenance for how filter words relate to care.

For guidance on mold and moisture in a home, read the EPA mold pages and the CDC mold page.

HEPA as a listing term

HEPA is a filter type that appears as a listing word. On a title, HEPA may come before or after the model name; on a bullet list, the line may say HEPA filter or True HEPA. The maker's page states what the maker says the filter does, how often it is cleaned or replaced, and whether replacement filters come from the maker only.

HEPA appears on portable and whole-house units. The word does not tell you the unit's capacity, its drain setup, or its operating range. Compare two listings on the stated details each listing prints.

• A HEPA line in the bullet list is a stated detail, not a measure of drying.
• Filter location is shown in the manual; see where the filter sits.

Activated carbon as a listing term

Activated carbon is a listing word that appears on units whose listings describe an odor feature. The maker's page describes how the carbon filter works and how it is replaced. Carbon filters are consumable parts: the maker usually sells replacements, and the listing states whether a carbon filter comes with the unit or is a separate purchase.

Read the odor description on the listing and the maker's page as the maker's own words, not as a promise about an outcome. See washable versus replaceable filters for the care question that follows a carbon filter.

Electrostatic filter as a listing term

Electrostatic is a filter word that refers to a filter the maker says uses static charge. Some listings print electrostatic or washable electrostatic as a filter line. An electrostatic filter is often described as washable, which makes filter care a shopping question rather than a feature you compare by.

The maker's page and manual state how the filter is cleaned and how often. The word does not change the unit's stated capacity or its drain setup.

A listing that prints electrostatic without the word washable still needs the maker's manual for the care step. If the manual is not linked from the listing, contact the maker before buying.

Washable versus replaceable filters

Filter care words follow the filter type. A listing may say washable filter or replaceable filter. Washable means the maker's manual describes the cleaning routine; replaceable means the maker sells a replacement part. Read the manual for the cleaning or replacement step; the maker's page and the manual are the only places that state it.

For a unit that runs often, or for a rental, filter care is a question to settle before buying. See filter cleaning frequency and filter maintenance.

For a unit in a rental or a home office, plan the filter care routine before you buy; a filter that needs frequent attention is a detail to settle up front.

Reading the maker's filter page

When a listing names a filter type, the next step is to open the maker's page for that model. The maker states the filter type, whether it is washable or replaceable, and where spare parts come from. If the listing is missing a detail, such as whether a filter is included, that detail is not stated by the seller and is a question for the maker.

Some filter listings print a MERV rating; see MERV rating on dehumidifier filter listings for what that word means on a listing. Comparing two units on stated details means comparing what each listing says about its filter, its capacity, and its drain options. The buying guides order picks by those stated details.

Filters on commercial and whole-house listings

Commercial and whole-house listings also print filter words. A whole-house unit listing may name a filter in the same place as its capacity and its ducted options. The filter type is still a stated feature: read the maker's page for what the filter does and how it is serviced. For a ducted unit, the filter and the duct connection are questions for the maker and a licensed installer.

For a portable unit, a filter word is one of several stated details. Decide first which room the unit serves, then compare capacity and drain options, and read the filter line as part of the same listing.

What to pick for your situation

Questions

Does a HEPA filter change a dehumidifier's stated capacity?

No. The capacity is the seller's stated pints per day label. A filter word is a stated feature; it does not change the unit's stated capacity.

Is an activated carbon filter replaceable?

That depends on the maker. The listing and the maker's page state whether a carbon filter is included and how it is replaced. Read those pages before buying.

Are electrostatic filters washable?

Many listings that print electrostatic also print washable. The maker's manual describes the cleaning routine; read it before you buy.

Where do I read the filter type on a listing?

Filter words appear in the title or the bullet list. After reading the listing, open the maker's page for the model to see what the maker says about the filter.

What is a MERV rating on a filter listing?

MERV is a filter rating word that some listings print. The maker's page states what the rating means for that filter. See MERV rating on dehumidifier filter listings.