Dehumidifier sizing
Dehumidifier Sizes Chart 2026: Pint Capacity by Room Size & Dampness (AHAM Standard)
Sizing chart + calculator Based on AHAM DH-1-2022 Reviewed by the WhatSize editorial team
Last reviewed June 2026 • Sources: AHAM DH-1-2022, ENERGY STAR, 10 CFR 430
Quick answer
Use the chart below to find your dehumidifier size by room square footage and dampness level. A 1,000 sq ft moderately damp space needs a 35-pint dehumidifier; very damp needs 50 pints. All recommendations follow the AHAM DH-1-2022 standard (tested at 65°F/60% RH). Need an exact number? Use our free calculator for a custom recommendation in 60 seconds.
Dehumidifier Sizing Table: Pints Per Day by Square Footage & Dampness
| Square Feet | Slightly Damp 50–60% RH |
Moderate 60–70% RH |
Very Damp 70–90% RH |
Wet 90–100% RH |
|---|---|---|---|---|
| 500 sq ft | 10 pt | 14 pt | 18 pt | 26 pt |
| 1,000 sq ft | 14 pt | 20 pt | 26 pt | 36 pt |
| 1,500 sq ft | 18 pt | 26 pt | 34 pt | 46 pt |
| 2,000 sq ft | 22 pt | 30 pt | 42 pt | 52 pt |
| 2,500 sq ft | 26 pt | 34 pt | 46 pt | 56 pt |
| 3,000 sq ft | 30 pt | 38 pt | 50 pt | 60 pt |
How to read: Find your room’s sq ft on the left. Match with your dampness level. Round up to the nearest standard size (22, 35, 50, or 70 pints). Color key: green = 22-pt zone, amber = 35-pt, orange = 50-pt, red = 70-pt minimum.
Adjustments: When to Add Extra Pints
High Ceilings
For ceilings over 8 ft, add 5% per extra foot. A 10-ft ceiling adds about 10% to the pint requirement.
Basement
Below-grade spaces need +5 extra pints. Cooler temps and less airflow reduce dehumidifier efficiency.
Laundry Nearby
Washer/dryer in the same space adds +5 pints. Laundry generates significant moisture during each cycle.
Example: 1,200 sq ft, moderately damp basement with laundry = 20 pt (base) + 5 (basement) + 5 (laundry) = 30 pt → round up to 35-pint dehumidifier.
Dehumidifier Size Comparison: 22-Pint vs 35-Pint vs 50-Pint vs 70-Pint
| Feature | 22 Pints | 35 Pints | 50 Pints | 70 Pints |
|---|---|---|---|---|
| Coverage (moderate) | 500–1,500 sq ft | 1,000–2,000 sq ft | 1,500–2,500 sq ft | 2,500+ sq ft |
| Typical Power Draw | ~300W | ~400W | ~500W | ~700W |
| Noise Level | 40–48 dB | 45–52 dB | 48–55 dB | 55–65 dB |
| Tank Size (typical) | 0.5–1 gal | 1–1.5 gal | 1.5–2 gal | 2–3 gal |
| Price Range | $150–$250 | $160–$270 | $200–$350 | $300–$1,800 |
| ENERGY STAR IEF Min | ≥1.70 L/kWh | ≥2.01 L/kWh | ≥2.01 L/kWh | ≥3.30 L/kWh |
| Old DOE Equivalent | ~30 pint | ~50 pint | ~70 pint | ~90+ pint |
Why Pint Ratings Changed: AHAM DH-1-2022 & the DOE 2019 Rule
If you bought a dehumidifier before 2020 and are shopping for a new one, you may notice the pint numbers look different. This is not because dehumidifiers got weaker — the test conditions changed.
Old Test (Pre-June 2019)
80°F / 60% RH
Warmer air holds more moisture, so dehumidifiers removed more water per day in the test chamber — leading to higher pint ratings that didn’t match real basement conditions.
New Test (June 2019 — Current)
65°F / 60% RH
Cooler air reflects real basement conditions. The new test standard produces pint ratings 30–45% lower, but the same dehumidifier performs identically in your home.
Source: ENERGY STAR — Dehumidifier Testing & Capacity, AHAM DH-1-2022, 10 CFR Part 430
Best Dehumidifiers by Size: Our Top Picks
Each pick below is matched to the AHAM DH-1-2022 pint rating. We verify specs against manufacturer data and sort by value — never by commission. Read our product policy.
Best 22-Pint Dehumidifiers — Small rooms, 500–1,500 sq ft
Best 35-Pint Dehumidifiers — Medium rooms, 1,000–2,000 sq ft
Best 50-Pint Dehumidifiers — Basements, 1,500–2,500 sq ft
Best 70-Pint Dehumidifiers — Large basements, 2,500+ sq ft, commercial
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Dehumidifier Sizing FAQ
How do I use this dehumidifier sizes chart?
Find your room’s square footage in the left column. Pick the dampness level that matches your space: slightly damp (no visible moisture), moderate (musty smell), very damp (condensation on walls), or wet (standing water). The intersecting cell gives the base pint requirement. Then apply adjustments: +5 pints for basements, +5 for laundry rooms, and +5% per foot of ceiling above 8 ft. Round up to the nearest standard size: 22, 35, 50, or 70 pints.
Why are new dehumidifier pint ratings lower than my old one?
The DOE changed the test standard in June 2019. The old test ran at 80°F — dehumidifiers removed more water because warm air holds more moisture. The new test runs at 65°F, closer to actual basement temperatures. A “50-pint” dehumidifier from 2018 is equivalent to today’s 35-pint rating. The machine didn’t change — the test did. Our chart above uses the current AHAM DH-1-2022 ratings.
Is it better to oversize or undersize a dehumidifier?
Oversizing is better. A larger dehumidifier removes moisture faster, cycles less often (extending compressor life), and handles humidity spikes from showers, cooking, or laundry. The only downsides: higher upfront cost (~$50-100 extra) and slightly higher power draw when running. ENERGY STAR recommends: “It’s better to oversize than undersize.”
What size dehumidifier for a 1,500 sq ft basement?
A 1,500 sq ft moderately damp basement needs a 50-pint dehumidifier (per the chart above: 26 pt base + 5 basement = 31 pt → round to 50). A very damp 1,500 sq ft basement (condensation, mold odor) needs a 70-pint unit. See our full basement dehumidifier guide for detailed scenarios.
Does ceiling height affect dehumidifier sizing?
Yes. A room with 10-ft ceilings contains about 25% more air volume than the same floor area with 8-ft ceilings. Add 5% to the pint requirement per extra foot above 8 ft. For a 1,000 sq ft room with 10-ft ceilings at moderate dampness: 20 pt base × 1.10 = 22 pt → round to 35-pint dehumidifier.
Need an Exact Recommendation?
Our free calculator factors in ceiling height, basement conditions, and laundry rooms for a custom pint size in 60 seconds.
Try the Dehumidifier Calculator