Fits checked Oct 1, 2026 · How we check
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Holmes · humidifier · portable evaporative

Holmes HM4000 replacement filter

Use part HWF65. Interval not published by the maker.

The filter that fits

From the maker's archived page

Holmes Filter C

Holmes HWF65CS (C) Humidifier Wick Filter

Part number
HWF65also sold as HWF65CS
How many
1 per unit
How often
Interval not published by the maker

Holmes does not say how many wick filters this model takes; one is assumed here, so check the old filter before ordering.

Buy Filter C on Amazon

Opens an Amazon search for Holmes Filter C HWF65. Check the listing says HWF65.

See the sources

Look-alike models that take a different filter

Holmes uses letter-coded wicks (A HWF62, B HWF64, C HWF65, D HWF75, E HWF100, F HWF23); look-alike models often take a different letter, so match the model number.

Sources

Medium confidence: from an archived manufacturer page, a licensed brand store, or a live manufacturer page that names a sibling variant rather than this exact model. Each line is the page we read and the day we read it.

  • Which filter fits web.archive.org Maker's archived page checked Oct 1, 2026
    Holmes HWF65CS (C) page: Works with Holmes® humidifiers (archive.org 2015-01-24): 'HM1888, HM1889, HM2059, HM3000, HM3800, HM3850, HM4000, HM1855, HM1865, HM1850, HM1851, HM1845, HM1840, HM1895, HM2060W'
  • What's in it web.archive.org Maker's archived page checked Oct 1, 2026
    'This filter is treated with an anti-microbial agent to inhibit the growth of mold, mildew and odor-causing bacteria'
Show all 4 sources

Which filter fits

  1. web.archive.org Maker's archived page checked Oct 1, 2026
    Holmes HWF65CS (C) page: Works with Holmes® humidifiers (archive.org 2015-01-24): 'HM1888, HM1889, HM2059, HM3000, HM3800, HM3850, HM4000, HM1855, HM1865, HM1850, HM1851, HM1845, HM1840, HM1895, HM2060W'
  2. web.archive.org Maker's archived page checked Oct 1, 2026
    Archive.org 2015-01-24: 'Holmes® humidifier filter part number HWF65, HWF65CS'
  3. web.archive.org Maker's archived page checked Oct 1, 2026
    Holmes HWF65PDQ-U page: Works with (archive.org 2015-03-02): 'HM1865, HM1895'

What's in it

  1. web.archive.org Maker's archived page checked Oct 1, 2026
    'This filter is treated with an anti-microbial agent to inhibit the growth of mold, mildew and odor-causing bacteria'