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What filter does a Emerson MoistAir HD-850 take?

It takes the Essick Air HDC3T Wick — OEM part number HDC3T.

Emerson MoistAir HD-850, evaporative humidifier, tabletop.

Lowest verified price: $19.95 — aftermarket, 2-pack replacement ($9.98 per wick) at DiscountFilters. Free shipping on orders $70+ at DiscountFilters; a fee applies below that. Checked 2026-11-11.
Buy the HDC3T on Amazon — HDC3TAmazon search for the exact part number (no single listing is endorsed). Amazon price is shown on Amazon; we do not quote it here.

The part, in brief

PartEssick Air HDC3T Wick
Replacement intervalReplace 2 times each season (FiltersFast).
Per changeFiltersFast sells the genuine HDC3T as a 6-pack (flagged Special Order when checked); DiscountFilters' replacement is sold in 2/4-packs.
EquivalentsBestAir Pro EPT, BestAir ALL-2, Kenmore 14920

Verified prices

OptionPriceStore & shipping
Genuine (OEM)
6-pack, genuine Essick HDC3T ($7.99 per wick)
$47.94FiltersFast
Free economy shipping on orders $99+ (lower 48); a fee applies below that · Checked 2026-11-11 · source
Aftermarket
2-pack replacement ($9.98 per wick)
$19.95DiscountFilters
Free shipping on orders $70+ at DiscountFilters; a fee applies below that · Checked 2026-11-11 · source

Full record with every price, source and date: Essick Air HDC3T Wick page.

Finding the model number on a Emerson MoistAir

Model numbers are on a label on the bottom or the back of the housing, usually starting with 'HD'. Emerson MoistAir consoles were built by Essick Air, which is why AIRCARE HDC wicks fit.