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The basement dehumidifier finder

A drier basement.
A better buying decision.

Start with your space, how damp it feels, and where the water will go. Build a practical plan before choosing a dehumidifier.

Size is only the startCapacity · temperature · drainage
Free, no signupNo humidity reading requiredPublished sizing guidance

1Tell us about your space.

How much floor area?

Length × width, in feet.
An estimate is fine to start.

2How does it feel?

Think about conditions before dehumidification.

3Where will the water go?

A size you can understandPublished bands, with the conditions behind them.
Cool basements matterOperating temperature is checked separately from capacity.
Plan the drain firstA pump and an empty-by-hand bucket solve different problems.
From a plan to a shortlist

Compare the useful numbers.

Two compact AlorAir models with published reference data. We show the cooler-condition capacity first. This limited selection is not a market-wide ranking or a guarantee that either model fits your home.

AlorAir Sentinel HD35P

23 pints/dayCooler-condition reference
35 pints/day80°F / 60% RH reference
A model to investigate for your plan
  • Reference capacity is within your starting band.
  • Confirm your lowest typical temperature.
  • Pump and gravity drainage are listed; confirm the route.
Published range: 33–105°FBuilt-in pumpNo collection bucket
See specification sources and dates

23 pints/day is from the ENERGY STAR registry export captured September 10, 2025. The 2026 manufacturer sheet lists 35 at 80°F / 60% RH. Confirm the exact unit’s current rating before buying; this is not a claim of current certification.

Capacity reference ↗
Manufacturer specification sheet ↗

The lower operating limit is not a promise of full rated removal at that temperature. Check pump lift, hose route, clearances and the exact model revision before purchase.

Check model details and current price

AlorAir Sentinel HD55P

32 pints/dayCooler-condition reference
55 pints/day80°F / 60% RH reference
A model to investigate for your plan
  • Reference capacity exceeds the top of your starting band.
  • Confirm your lowest typical temperature.
  • Pump and gravity drainage are listed; confirm the route.
Published range: 33–105°FBuilt-in pumpNo collection bucket
See specification sources and dates

The manufacturer’s sample data plate lists 32 pints/day at 65°F / 60% RH and 55 at 80°F / 60% RH. The plate is dated November 3, 2023. Confirm the rating on the current unit and its installation instructions.

Capacity reference ↗
Manufacturer specification sheet ↗

The lower operating limit is not a promise of full rated removal at that temperature. Check pump lift, hose route, clearances and the exact model revision before purchase.

Check model details and current price

Sources reviewed 2026-09-14. Prices and stock are checked at the store. These are direct manufacturer links. They do not currently earn commission.

A clear method

Useful guidance. Visible assumptions.

The basement estimate follows the ENERGY STAR portable-dehumidifier sizing chart. A measured humidity value replaces the symptom estimate. At exactly 2,000 sq ft we use the larger-space band. The chart is not a crawl-space or whole-home engineering calculation.

See the sizing bands and limitations

Source: ENERGY STAR dehumidifier buying guidance.

Before you choose

A few details can change the right answer.

Do I need a humidity meter to use this?

No. Start with the conditions that best describe the space. A hygrometer can improve the input; a musty smell alone does not measure humidity or identify the source of a moisture problem.

Why does a “55-pint” model show 32 pints here?

Those numbers come from different test conditions. The manufacturer’s HD55P sample plate lists 55 at 80°F / 60% RH and 32 at 65°F / 60% RH. We keep the references separate, and ask you to verify the current unit.

Is a pump always better?

A pump is useful when the discharge point is above the unit. A suitable downhill drain may work by gravity. Confirm the permitted vertical lift, hose length and routing in the exact model’s instructions.

Will this fix leaking walls or guarantee mold removal?

No. The tool helps plan moisture-control equipment. Leaks, standing water and the source of dampness need their own assessment and repair.

Make the next decision easier

Two short guides. A better plan.

What size dehumidifier does a basement need?

Read the capacity band, the test conditions and the limits.

Read the guide

A built-in pump or a gravity drain?

Plan the water’s path before choosing the machine.

Read the guide