What it costs
A whole-basement dehumidifier installed costs about $1,100–$2,800.
Source: HomeGuide: basement waterproofing cost. Price your basement with the cost estimator.
Worth knowing
- Right fix when walls sweat but no water is coming in
- EPA advises keeping humidity below 60%, ideally 30–50%
- Drain the unit to a sump or floor drain so it runs unattended
- Insulating cold water pipes stops dripping from condensation
What to send contractors
- Basement size and whether it is finished
- Humidity reading if you have one
- Where the unit could drain
Questions
How do I know it is humidity and not a leak?
Use the foil test: tape foil to the damp wall for a day or two. Moisture on the room side points to condensation. The wet basement checker walks through it.
