Dehumidifier sizing Last reviewed June 2026

What Size Dehumidifier for a 500 Sq Ft Room?

By the WhatSize editorial team 5 min read Standards-reviewed

TL;DR

For a 500 sq ft room with moderate dampness, you need a 22-pint dehumidifier. If the space is very damp or is a basement, go with 35 pints.

Looking for a different size? See What Size Dehumidifier for a 1,000 Sq Ft Space? or browse all dehumidifier sizing guides.

Why Room Size Matters for Dehumidifier Selection

A 500 sq ft room is considered a medium-sized space by AHAM standards. At this size, a dehumidifier rated for 22 pints (under the 2019 DOE standard) can handle typical humidity levels in a living room, bedroom, or office.

The key variable is dampness level. A slightly damp 500 sq ft room only needs about 10 pints of moisture removal per day, while a very damp room of the same size could need 18-20 pints. That's why the extra capacity is important — a 22-pint unit comfortably covers both scenarios.

Top picks for this size

BEST OVERALL

Danby DDR020BJ2WDB #ad

22-pint, ENERGY STAR, Smart Dehumidify

★★★★☆ 4.5 · 65+ ratings

Smart Dehumidify ModeENERGY STAR CertifiedAuto Restart

$168 approx

Check price

BUDGET

Keystone 22-Pint Energy Star Dehumidifier #ad

★★★★☆ 4.6 · 14+ · $187

Amazon

These Amazon-available picks meet the calculated spec. For region-specific or licensed contractor-installed options, consult a local professional. See our Disclaimers.

When to Go Up to 35 Pints for a 500 Sq Ft Space

If the room is a basement — below-grade spaces need +5 extra pints due to cooler temperatures and less airflow
If you have a washer/dryer in the same space — laundry adds significant moisture
If the room has visible condensation on walls or windows
If the humidity is consistently above 70% RH

Frequently asked questions

What size dehumidifier for 500 sq ft?

Yes. A 35-pint dehumidifier works fine in a 500 sq ft room. It will cycle off more quickly than a 22-pint unit, which can save energy. There's no downside to having extra capacity — the dehumidifier simply runs less often.

Should I run a dehumidifier 24/7?

Most modern dehumidifiers are designed for continuous operation. Set your target humidity to 45-55% and let the unit cycle on and off automatically.

What's the difference between 22-pint and 35-pint dehumidifiers?

Under the 2019 DOE standard, a 22-pint dehumidifier removes 22 pints of moisture per day at 65°F/60% RH. A 35-pint removes 35 pints. The 35-pint is better for damp basements, laundry rooms, or larger spaces up to 1,500 sq ft.