Dehumidifier Energy Efficiency and Energy Star

Volume I  ·  May 2026  ·  342 words

A dehumidifier operating 12 hours per day during humid months consumes 300–600 kWh annually — roughly $40–90 at average U.S. electricity rates. The difference between the most and least efficient units in the same capacity class is approximately 30–50% in annual energy consumption, making the Energy Star rating a meaningful economic consideration over the unit's 5–10 year service life.

Integrated Energy Factor (IEF). The DOE's 2019 test procedure replaced the previous Energy Factor metric with the Integrated Energy Factor, measured in liters of water removed per kilowatt-hour (L/kWh). An IEF of 2.0 L/kWh means the dehumidifier removes 2.0 liters of water for every 1 kWh of electricity consumed. Energy Star certification requires an IEF of at least 2.0 L/kWh for units up to 50 pints, and 2.5 L/kWh for units above 50 pints. The Midea 50-pint Energy Star achieves approximately 2.1–2.3 L/kWh. The difference in annual electricity cost between a unit at 2.0 L/kWh and one at 2.5 L/kWh with identical usage is approximately $10–20 per year — modest but cumulative over the dehumidifier's lifetime.

Efficiency at partial load. The IEF is measured at standard conditions (80°F, 60% RH) and does not reflect efficiency at lower temperatures where compressor dehumidifiers spend significant time in defrost mode. A dehumidifier with a high IEF at 80°F may be less efficient than a lower-rated competitor at 65°F if the competitor's defrost algorithm is smarter about when to initiate and terminate defrost cycles. The IEF is a useful comparison metric within the compressor dehumidifier category but does not meaningfully compare compressor and desiccant technologies, which operate on different efficiency curves versus temperature and have different IEF measurement standards.