dehumidifier size litres

What dehumidifier capacity do you actually need?

Estimate litres/day from volume, how damp the space feels, and indoor laundry. Not a laboratory rating.

You want an indicative dehumidifier capacity, not a model to buy.

  1. Enter floor area and ceiling height of the zone you will treat (not the whole house if doors stay shut).
  2. Say whether you dry laundry indoors and whether you suspect rising damp.
  3. If the diagnosis points to a wet wall, the tool will tell you to inspect before buying.

Indicative capacity

22 L/giorno

Indicative estimate: about 22 litres/day on the nameplate. Makers often rate at 30 °C and 80 % RH, rare in a winter living room. Not a lab sheet and not a model recommendation.

Manufacturer litres/day are often rated at 30 °C and 80% RH — rare in a winter living room.

Useful next step

Compare with running cost and the diagnosis: indoor vapour is a dehumidifier job; rising damp is not.

What may help (after diagnosis)

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10–25 €

Digital hygrometer (probe if you can)

Without a relative-humidity number, every tip is guesswork. A €10–25 hygrometer is the first useful purchase — before any dehumidifier.

When: Always, as the first diagnostic step.

Not when: It does not replace a moisture meter or a rising-damp survey.

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80–350 €

Compressor dehumidifier

Useful if indoor air sits above ~60–65% and the cause is indoor vapour (showers, cooking, laundry), not a wall wet from below.

When: Measured high RH, window condensation, indoor drying, windowless bath.

Not when: Rising damp, leaks, stains that start at the skirting and climb.

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FAQ

Is this the dehumidifier I should buy?+

No. It is an indicative capacity estimate. Brand and model stay your choice, after diagnosis.

Why do nameplate litres lie in winter?+

The lab test is warm and wet. In a 19 °C living room output drops, especially on small compressor units.

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