Basement Waterproofing · Buying guides · Updated November 2026
Choosing a Basement Dehumidifier: Capacity, Drainage and Placement
A good dehumidifier keeps basement humidity in a healthy range and reduces musty smells. The three decisions are capacity, how it drains, and where it goes.
Target humidity
The EPA recommends keeping indoor humidity below 60%, ideally between 30% and 50%. Measure first with a hygrometer (how to measure humidity).
Capacity
- Capacity is listed in pints of water removed per day.
- The Department of Energy changed its test method in 2019, so newer models list lower pint numbers than older models of similar size. Compare models rated under the same standard.
- Larger and damper basements need more capacity. When in doubt, a slightly larger unit running less often usually works better than a small unit running constantly.
Drainage options
| Option | Pros | Cons |
|---|---|---|
| Bucket | Works anywhere | Must be emptied, often daily in damp basements |
| Gravity hose | Continuous; no emptying | Needs a floor drain or sump pit lower than the unit |
| Built-in pump | Can pump up to a sink or out a window | Costs more; another part that can fail |
Placement and features
- Place it in the center of the damp area with space around it for airflow; close basement windows.
- Cool basements need a model rated for low temperatures with automatic defrost.
- Look for ENERGY STAR certification, a washable filter, and auto-restart after power outages.
- For whole-basement or crawl space control, an installed whole-house dehumidifier runs $800–$2,000 (basement waterproofing cost guide).
A dehumidifier treats damp air, not water coming through walls. If you see water, see damp basement walls.
Cost figures are national ranges from the sources listed in our basement waterproofing cost guide, not a quote from FixFinch or any contractor.