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Dehumidifier Size Calculator

Start with your space and how damp it gets. We translate the old chart into a current shopping class.

HomeClimateScout Editors Updated How we rate →
1. Where will it run?

Square feet · length × width. Chart covers up to 2,500 sq ft.

3. How damp is it in humid weather?

Default below: 2,000 sq ft wet basement. Enable JavaScript to change the estimate.

Your starting point

Buy a 50 pint class

Today · DOE 2019 class 50 pints/day DOE test at 65°F
Historical shopping label 70 pints/day Old test at 80°F

Same shopping category, two rating eras. These bins are approximate, not a model-specific conversion.

How we got it

Chart need: 32 pints/day at 80°F → 35-pint current class → basement size-up → 50-pint class.

See our basement picks →

For a room, skip the size-up. For a basement or crawl space, our editorial rule adds one class, capped at 50. Fix leaks and standing water first.

Models for the default wet basement

These 50-pint-class portables match the default estimate. Recheck capacity and drainage for your result; this list does not change when you change the inputs.

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Midea Cube 50-Pint Dehumidifier with Pump (MAD50PS1QWT-A)

Midea Cube 50-Pint Dehumidifier with Pump (MAD50PS1QWT-A)

$249.99 Archived Amazon · as of

No verified exact-model offerExact pump offer could not be verified on Oct 17, 2026; its purchase link is disabled. Displayed prices are dated historical snapshots.
Honeywell TP-Fit 50-Pint Dehumidifier with Pump (TPFIT50PWK)

Honeywell TP-Fit 50-Pint Dehumidifier with Pump (TPFIT50PWK)

$396.83 Archived Amazon · as of

View at Amazon

Cost over 5 years

Purchase price and estimated power

CostMidea MAD50PS1QWT-A
Purchase$249.99Amazon ·
Power · 5 years$471.48Estimate using July 2026 EIA rate.
Total estimate$721.47Purchase snapshot 2026-10-11; July 2026 power rate; installation excluded.

Midea MAD50PS1QWT-A
$7.86 /month estimated powerEstimate using July 2026 EIA rate. ENERGY STAR: 515 kWh/year, includes low-power modes.

EIA U.S. residential average: 18.31¢/kWh · July 2026 (released September 24, 2026). Your tariff and usage will differ.

ENERGY STAR annual energy uses 1,095 active hours (3 hours/day) plus low-power energy. We scale the whole annual figure by hours ÷ 3: an approximation because standby energy does not scale with active hours. Five-year cost = dated purchase price + annual estimated power × 5; no inflation or repairs.

ENERGY STAR v6 annual-energy method · checked Oct 16, 2026

The size chart

Our DOE 2019 portable shopping class (65°F / 60% RH) before the basement/crawl-space step. Below each class: historical AHAM need at 80°F. Class bins are editorial, not an exact ENERGY STAR conversion.
Area · sq ft Moderately dampVery dampWetExtremely wet
500 20 pt/day class 10 pt/day · AHAM at 80°F 20 pt/day class 12 pt/day · AHAM at 80°F 20 pt/day class 14 pt/day · AHAM at 80°F 20 pt/day class 16 pt/day · AHAM at 80°F
1,000 20 pt/day class 14 pt/day · AHAM at 80°F 20 pt/day class 17 pt/day · AHAM at 80°F 20 pt/day class 20 pt/day · AHAM at 80°F 20 pt/day class 23 pt/day · AHAM at 80°F
1,500 20 pt/day class 18 pt/day · AHAM at 80°F 20 pt/day class 22 pt/day · AHAM at 80°F 20 pt/day class 26 pt/day · AHAM at 80°F 20 pt/day class 30 pt/day · AHAM at 80°F
2,000 20 pt/day class 22 pt/day · AHAM at 80°F 20 pt/day class 27 pt/day · AHAM at 80°F 35 pt/day class 32 pt/day · AHAM at 80°F ← Your chart cell 35 pt/day class 37 pt/day · AHAM at 80°F
2,500 20 pt/day class 26 pt/day · AHAM at 80°F 35 pt/day class 32 pt/day · AHAM at 80°F 35 pt/day class 38 pt/day · AHAM at 80°F 35 pt/day class 44 pt/day · AHAM at 80°F

How the calculator works

  1. Round the area up to the next AHAM chart row; read the dampness column.
  2. Choose the smallest historical class (30, 50, 70) covering that need.
  3. Map to our conservative current shopping classes (20, 35, 50). This is an editorial convention, not an exact rating conversion.
  4. For a basement or crawl space, move up one class, capped at 50. Larger or persistently wet spaces need professional assessment.

ENERGY STAR’s model correlations differ: old 50 ≈ new 30, old 60 ≈ new 35, old 70 ≈ new 40–45. The larger shopping bins here are deliberately conservative. Humidity load, temperature, air leakage, and drainage all matter.

Understand the two rating eras →

Sources & checks

View all 3 source records and check dates