Why a 50‑pint isn’t what it used to be

In 2019, the U.S. Department of Energy updated the dehumidifier test procedure. Portable units are now rated at 65°F (instead of the old 80°F), and efficiency moved to an updated metric called Integrated Energy Factor (IEF). Whole‑home units reference 73°F. Because cool air holds less moisture than warm air, the same physical machine reports a smaller capacity in pints/day under the new test.

Old vs new at a glance

• Old (legacy AHAM): 80°F / 60% RH; “Energy Factor (EF)” efficiency.
• Current (DOE appendix X1): 65°F / 60% RH for portable; 73°F / 60% RH for whole‑home; “Integrated Energy Factor (IEF).”

ENERGY STAR notes that starting in 2019/2020, capacities and energy labels changed to reflect these cooler, more realistic conditions — especially important for basements.

Sources: DOE appendix X1 test method; ENERGY STAR dehumidifier testing and capacity.