Data sources

Certified dehumidifiers

U.S. Environmental Protection Agency, ENERGY STAR® Certified Dehumidifiers dataset (opens in a new tab).

Capacity, yearly energy use, efficiency (IEF), refrigerant, Wi-Fi, filing company, and brands of every certified model: 482 models sold in the United States.

List updated Oct 15, 2026, read Oct 16, 2026. The EPA updates it daily.

Sizing table

ENERGY STAR (U.S. EPA), dehumidifier sizing table (opens in a new tab).

The pints a day a space needs, by dampness and floor area. Used, unchanged, by every calculator.

Read Oct 5, 2026.

Indoor humidity

U.S. Environmental Protection Agency, A Brief Guide to Mold, Moisture and Your Home (opens in a new tab).

The humidity range the EPA recommends indoors, 30 to 50% and below 60%, and its advice on mold cleanup and bathroom fans.

Page updated Feb 18, 2026, read Oct 5, 2026.

Electricity prices

U.S. Energy Information Administration, Electric Power Monthly, Table 5.6.A (opens in a new tab).

The average home electricity price in each state and DC (51 prices) and the U.S. average, 18.31¢ a kWh.

Prices for July 2026, read Oct 18, 2026.

Homes and cooling

U.S. Energy Information Administration, 2020 Residential Energy Consumption Survey (RECS), state data (opens in a new tab).

How homes in each state are cooled, whether they have a basement or use a dehumidifier, and their average floor area. The Florida and Hawaii guides quote these figures.

Survey of 2020, tables published March 2023, read Oct 6, 2026.

Recalls

U.S. Consumer Product Safety Commission, recalls (opens in a new tab).

18 dehumidifier recalls: date, units, hazard, remedy, brands, and model numbers named.

Read Oct 4, 2026.

Buying guidance

ENERGY STAR (U.S. EPA), Dehumidifiers: buying guidance and saving tips (opens in a new tab).

What the guides quote on draining, low temperatures, whole-house units, placement, and the built-in humidistat.

Read Oct 5, 2026.

Program rules

ENERGY STAR (U.S. EPA), ENERGY STAR Program Requirements for Dehumidifiers, Version 6.0 (opens in a new tab).

Which products the program covers (consumer dehumidifiers) and how it defines a dehumidifier.

In effect since Oct 1, 2025, read Oct 5, 2026.

Crawl spaces

U.S. Department of Energy, Building America Solution Center, Look at Crawlspace for Moisture Issues (opens in a new tab).

What signals moisture problems in a crawl space, and the role of a dehumidifier in a sealed one.

Page updated Sep 10, 2025, read Oct 5, 2026.

DOE certification filings

U.S. Department of Energy, Compliance Certification Database (opens in a new tab).

The capacity and efficiency filed for each model sold in the United States: 1,209 entries. We use it only for models that aren’t on the EPA list, and say so on their page. The database blocks automated access, so we read an export made by hand.

Export of Oct 5, 2026.

Federal rules

Code of Federal Regulations, 10 CFR Part 430, sections 430.2 and 430.32, and Appendix X1 to Subpart B (opens in a new tab).

The legal definition of a dehumidifier, portable or whole-house, and the minimum efficiency every unit sold must reach. It also gives the conditions of the federal test: 65°F and 60% humidity for portables, 73°F for whole-house units.

Annual edition revised as of Jan 1, 2025, on govinfo.gov, read Oct 7, 2026.

Lifetime

U.S. Department of Energy, Energy Conservation Standards for Dehumidifiers, final rule (Federal Register) (opens in a new tab).

The average lifetime the DOE estimated when it set today’s standards: about 11 years for a portable, 19 for a whole-house unit.

Published Jun 13, 2016, read Oct 5, 2026.

Test rules

U.S. Department of Energy, Test Procedures for Dehumidifiers, final rule (Federal Register) (opens in a new tab).

How capacity is rated since 2019, and which machines the rules cover: refrigerant units, not desiccant-only ones.

Published Jul 31, 2015, read Oct 5, 2026.

Air cleaners and humidifiers

U.S. Environmental Protection Agency, Guide to Air Cleaners in the Home; and Use and Care of Home Humidifiers (opens in a new tab).

What air cleaners do and don’t do about moisture, and the humidity limit the EPA sets for humidifiers.

Pages updated Oct 1, 2026 and Apr 29, 2026, read Oct 5, 2026.

Flood cleanup

U.S. Environmental Protection Agency, Flood Cleanup: Protect Indoor Air and Your Health (opens in a new tab).

How to dry a home after a flood, fans and dehumidifiers included, as the Florida guide quotes it.

Page updated Mar 18, 2026, read Oct 6, 2026.

Climate normals

NOAA National Centers for Environmental Information, U.S. Climate Normals 2020: U.S. Hourly Climate Normals (1991–2020) (opens in a new tab).

Hourly normal temperature and dew point at 445 weather stations in the 50 states, averaged by month for the humidity tool. NOAA asks to cite it as Palecki, M.; Durre, I.; Applequist, S.; Arguez, A.; Lawrimore, J. (2021). U.S. Climate Normals 2020: U.S. Hourly Climate Normals (1991-2020). NOAA National Centers for Environmental Information. https://doi.org/10.25921/e3zh-ag77

Read Oct 5, 2026.

Humidity formula

National Weather Service, Vapor Pressure (formula) (opens in a new tab).

The formula that turns a temperature and a dew point into relative humidity, and back, used by the humidity tool and its dew point calculator. Its glossary gives the definition of the dew point we quote.

Read Oct 5, 2026.

Store ranges

AlorAir and Argendon, product feeds of their affiliate programs, through Awin.

The names of the series each store sells, its listing pages, and photos. The range pages our buttons open come from each store’s sitemap. We show no prices, capacities, or descriptions from them.

Feeds imported Jun 26, Jun 27, and Jun 29, 2026, read Oct 6, 2026.

Model names

Retail listings, HVACDirect product pages (not linked: we may apply to its affiliate program).

The DOE lists some brands by part number only. To tie a name to a part number, we read the title of a store listing whose terms allow it. The model’s page names the seller, and nothing else from the listing is used.

Listing and its terms read Oct 5, 2026.

Rights and trademarks

Data from U.S. federal government sources is generally in the public domain. We don’t claim rights in it, only in how we organize and present it.

The figures we show are those of each source on the date given. How we compare explains how we use them.