The Pint Rating Conversion Index
In 2019 the U.S. Department of Energy changed the test conditions used to rate dehumidifier capacity — from 80°F/60% relative humidity to 65°F/60% RH. The identical physical machine condenses less water in cooler air, so its official pint rating dropped, generally by somewhere in the neighborhood of 30-40% for portable units. An old "70-pint" dehumidifier is, roughly, today's "40-45 pint" model. This page is the normalized conversion table — a reference dataset, not a buying guide.
The one thing to know: In a final rule published June 13, 2016, the U.S. Department of Energy changed how portable dehumidifier capacity is measured, effective for units manufactured on or after June 13, 2019. The test moved from 80°F/60% relative humidity to 65°F/60% RH — a temperature much 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.
Portable dehumidifier conversion table
| Old rating (pre-2019, 80°F) | New rating (2019+, 65°F) | DOE product class | Approx. reduction |
|---|---|---|---|
| 30 pt | 20 pt | Class 1 (≤25.00 pt/day) | ~33% |
| 40 pt | 25 pt | Class 2 (25.01-50.00 pt/day) | ~37% |
| 50 pt | 30 pt | Class 2 (25.01-50.00 pt/day) | ~40% |
| 55 pt | 30-35 pt | Class 2/3 boundary | ~38-45% |
| 60 pt | 35 pt | Class 3 (>50.00 pt/day) | ~42% |
| 70 pt | 40-45 pt | Class 3 (>50.00 pt/day) | ~36-43% |
| 90 pt | 55 pt | Class 3 (>50.00 pt/day) | ~39% |
Basis: old rating measured at 80°F/60% RH; new rating measured at 65°F/60% RH — both at 60% relative humidity, per DOE's 2016 final rule (effective June 13, 2019). Figures are ENERGY STAR's published reference pairs, not a fixed mathematical formula — treat each row as the industry-recognized general equivalence, not an exact per-model constant.
Whole-home / ducted dehumidifier conversion table
Whole-home and ducted units are tested and rated under a separate DOE product class with its own pint scale and a smaller observed reduction than portable units.
| Old rating (pre-2019, 80°F) | New rating (2019+, 65°F) | Approx. reduction |
|---|---|---|
| 80 pt | 70 pt | ~13% |
| 100 pt | 85 pt | ~15% |
| 120 pt | 100 pt | ~17% |
| 140 pt | 115 pt | ~18% |
| 160 pt | 135 pt | ~16% |
| 200 pt | 170 pt | ~15% |
AHAM coverage by room size and dampness level
Sizing a dehumidifier takes two inputs: square footage AND how damp the space is. This table uses current (2019-standard) pint ratings and assumes a standard 8-foot ceiling — for taller ceilings, AHAM's own adjustment factors run roughly 1.13x at 9 feet up to about 1.5x at 12 feet.
| Room size | Moderately damp | Very damp | Wet | Extremely wet |
|---|---|---|---|---|
| 300 sq ft | 20 pt | 20 pt | 25 pt | 30 pt |
| 500 sq ft | 20 pt | 25 pt | 30 pt | 35 pt |
| 800 sq ft | 20 pt | 25 pt | 30 pt | 40 pt |
| 1,000 sq ft | 25 pt | 30 pt | 35 pt | 45 pt |
| 1,200 sq ft | 25 pt | 30 pt | 40 pt | 45 pt |
| 1,500 sq ft | 30 pt | 35 pt | 45 pt | 50 pt |
| 1,800 sq ft | 30 pt | 40 pt | 45 pt | 55 pt |
| 2,000 sq ft | 35 pt | 45 pt | 50 pt | 60 pt |
| 2,500 sq ft | 40 pt | 50 pt | 55 pt | 65 pt |
| 3,000 sq ft | 45 pt | 55 pt | 60 pt | 70 pt |
| 3,500 sq ft | 50 pt | 60 pt | 65 pt | 70+ pt |
| 4,000 sq ft | 50 pt | 65 pt | 70 pt | Whole-home |
| 4,500+ sq ft | 55 pt | 70 pt | Whole-home | Whole-home |
Cross-reference: ENERGY STAR and AHAM
ENERGY STAR is the primary source for the pre/post-2019 conversion pairs above (its published dehumidifier testing-and-capacity reference). ENERGY STAR certification — and the higher "Most Efficient" tier — is based on a unit's Integrated Energy Factor (IEF), not raw pint capacity, so a smaller-capacity certified unit can be more efficient per pint than a larger uncertified one. AHAM (Association of Home Appliance Manufacturers) publishes the room-size-by-dampness sizing convention used across the industry, reflected in the coverage table above.
Caveats — read before citing a row
- This is a general equivalence, not a per-model formula. The ~25-45% reduction range varies by specific machine, coil design, and fan speed — always check a specific model's own 2019-standard spec sheet rather than back-calculating from an old badge.
- Old marketing material and old physical units still exist. A used or old-stock "70-pint" unit was tested under the pre-2019 standard; it was never re-tested to a lower number — the rating on its box is simply not comparable to a new unit's box without this table.
- Whole-home and portable classes do not share a pint scale. Never compare a whole-home "85-pint" rating directly to a portable "85-pint" rating.
- This is an equipment-specification reference, not a health or mold-safety determination. Dehumidifier capacity and coverage specs describe moisture-removal performance, not mold prevention or any health outcome. Mold and excess humidity can be health-relevant, but we stay on equipment specifications here and defer questions about mold health effects to the EPA, your local health department, or a qualified indoor air quality professional.
- Standards can be revised again. DOE issued further test-procedure and standards rulemakings in 2023; this index reflects the 2019 capacity-test change specifically, as understood as of the version date below.
How to cite this dataset
Dehumidifier Decoded. "Pint Rating Conversion Index," version 1.0, July 30, 2026. https://dehumidifier-decoded.pages.dev/pint-rating-conversion-index/. Licensed CC BY 4.0.
License: CC BY 4.0 — free to use with attribution. This dataset is released under a Creative Commons Attribution 4.0 International license. You may reuse, adapt, and redistribute it, including commercially, provided you credit Dehumidifier Decoded and link back to this page.
Methodology & versioning
Version 1.0 — published July 30, 2026. Conversion pairs are drawn from ENERGY STAR's public dehumidifier testing-and-capacity reference, cross-checked against the DOE's June 13, 2016 final rule (energy conservation standards for dehumidifiers, effective June 13, 2019) and Federal Register test-procedure filings. AHAM coverage figures follow the industry-standard room-size-by-dampness convention used across manufacturer sizing guides. We do not test dehumidifiers ourselves; this is a specification-and-rule reference, not a lab result. Corrections: if a conversion pair or rule detail changes or we find an error, this page and the CSV are updated in place and the version/date bumped — see How We Evaluate for our full editorial policy.
Machine-readable download: the full table is available as CSV at /pint-rating-conversion-index.csv (version-pinned copy: /pint-rating-conversion-index-v1.0.csv), and a condensed digest is maintained in /llms-full.txt.
This page is a specification and regulatory-history reference, not a health, safety, or mold-related determination for your specific space.
Frequently Asked Questions
A normalized reference table showing how the same physical dehumidifier's advertised pint capacity changed when the U.S. Department of Energy switched its test conditions from 80°F/60% RH to 65°F/60% RH, effective for units manufactured on or after June 13, 2019. It exists because a '50-pint' badge means two different things depending on which test standard produced it.
Roughly, yes, as a general pattern — not an exact per-model rule. Based on ENERGY STAR's published conversion reference, a machine that would have earned about a '70-pint' rating under the pre-2019 test (80°F) earns roughly '40-45 pints' under the current 2019 test (65°F). A rating closer to '50-pint' under the current test is closer to what used to be called '60-pint.' See the full breakdown at Is a New 50-Pint Dehumidifier the Same as an Old 70-Pint?
The DOE's 2016 final rule (effective June 13, 2019) lowered the test temperature from 80°F to 65°F, closer to a real basement's typical temperature. Cooler air holds less moisture, so the identical hardware condenses fewer pints of water during the standardized test and earns a lower official capacity number — even though the machine itself did not change.
No. Our table shows roughly 33-42% reductions for portable units across different old capacity points, and a smaller roughly 13-18% reduction for whole-home/ducted units, based on ENERGY STAR's published reference pairs. Individual models vary from these figures — this index shows the general, industry-recognized pattern, not an exact formula you can apply to any specific unit.
Whole-home and ducted dehumidifiers are tested and rated under a separate DOE product class with its own pint scale, shown in the second table below. Their pre-to-post-2019 reduction is smaller (roughly 13-18%) than portable units, and a whole-home unit's pint number is never directly comparable to a portable unit's pint number.
ENERGY STAR publishes its own capacity-conversion reference at energystar.gov/products/dehumidifier_testing_and_capacity, which is the primary source for the exact pairs in this table. The underlying rule is DOE's dehumidifier energy conservation standards final rule (June 13, 2016), effective June 13, 2019.