Key Facts: Dehumidifier Pint Ratings
This page is Dehumidifier Decoded's maintained fact reference — the regulatory and specification facts our guides are built on, restated in plain prose. We report equipment specifications, never health-outcome claims.
The 2019 DOE test change
DOE's June 13, 2016 final rule set current energy conservation standards for dehumidifiers manufactured on or after June 13, 2019. The capacity test moved from 80°F/60% relative humidity to 65°F/60% RH — closer to a real basement. Cooler air holds less moisture, so the identical physical machine condenses fewer pints during the test and earns a lower official rating, even though nothing about the hardware changed. Full explainer: What Is the DOE Dehumidifier Test Procedure?
Old-to-new pint conversion
As a general, ENERGY-STAR-sourced pattern (not a fixed formula), a portable unit that earned roughly "50-pint" before 2019 earns roughly "30-pint" today; a "70-pint" unit before now earns roughly "40-45 pints." The reduction runs in the rough neighborhood of 30-40% for portable units and a smaller 13-18% for whole-home/ducted units. Full table: The Pint Rating Conversion Index. The single most common question — is a new 50-pint the same as an old 70-pint? — gets its own page.
IEF replaced EF
Alongside the 2019 test change, Integrated Energy Factor (IEF) replaced the older Energy Factor (EF) metric. Unlike EF, IEF accounts for the energy a dehumidifier draws even while cycled off, so efficiency comparisons between a pre-2019 EF-rated unit and a current IEF-rated unit are not directly comparable either. More at What Is IEF?
DOE product classes
Portable dehumidifiers fall into three DOE product classes by capacity: Class 1 (25.00 pints/day or less), Class 2 (25.01-50.00 pints/day), and Class 3 (50.01 pints/day or more). Whole-home and ducted dehumidifiers are tested and rated under a separate product class with its own pint scale — never compare a whole-home rating directly to a portable rating.
AHAM sizing by room size and dampness
Correct sizing needs two inputs: square footage and dampness level (moderately damp, very damp, wet, or extremely wet), assuming a standard 8-foot ceiling. Taller ceilings need more capacity — AHAM's adjustment factors run roughly 1.13x at 9 feet up to about 1.5x at 12 feet. Full chart and basement-specific guidance: How Many Pints Do I Need for My Basement?
ENERGY STAR and "Most Efficient"
ENERGY STAR certification — and its higher "Most Efficient" tier — is based on a unit's IEF, not its raw pint capacity. A smaller-capacity certified unit can be more efficient per pint removed than an uncertified larger one. ENERGY STAR also publishes the primary old-to-new capacity conversion reference this site's index is built from.
What this site does not claim
We report pint capacity, test conditions, IEF, and coverage sizing — equipment specifications. We do not make mold-prevention or other health-outcome claims. Mold and humidity can be health-relevant, but for a specific concern we defer to the EPA, your local health department, or a qualified indoor air quality professional.
How these facts are maintained
These facts are drawn from DOE Federal Register rulemakings, ENERGY STAR's published test-and-capacity reference, and AHAM sizing conventions, reviewed against our guides and updated on the date shown above when rules or the market change. We do not publish exact prices, every pick names an honest drawback, and we report specification facts, never health-outcome claims. Our full methodology is at How We Evaluate Dehumidifiers.