Dehumidifier
A dehumidifier removes water vapor from the air. Restoration crews use refrigerant-style LGR units and desiccant units depending on the dry-down profile.
Dehumidifiers pull the evaporated water out of the air during structural drying — without them, the moisture just re-condenses back onto materials.
The practical reason this term exists.
Air movers evaporate water from wet surfaces into the air. Dehumidifiers then capture that water and exhaust it as condensate. Run air movers without dehumidification and you've moved the problem from the wall to the air, where it'll redeposit.
Restoration uses two main types: low-grain refrigerant (LGR) dehumidifiers for the bulk of residential drying, and desiccant dehumidifiers for cold environments or specialty materials where refrigerant units lose efficiency.
In real life, the term shows up here.
On a drying log next to its placement location and grains-per-pound readings.
On a restoration scope as one of the equipment line items.
On the noise complaint from upstairs when one is running overnight (they're loud).
In the field.
EcoClean sizes dehumidifier capacity to the affected square footage and the grains-per-pound reading the crew takes before placement. Undersized capacity stretches the dry-down. Oversized capacity wastes equipment but doesn't hurt the building.
Daily atmospheric readings (temperature, relative humidity, grains-per-pound) on the drying log track whether the dehumidification is working.
Questions homeowners ask about dehumidifier.
What does LGR mean on a dehumidifier?
LGR stands for low-grain refrigerant. LGR dehumidifiers can pull moisture out of air at lower grains-per-pound levels than standard refrigerant units — which matters during the late phase of dry-out when the air is already dry.
Why does the dehumidifier need to drain or be emptied?
The captured water has to go somewhere. Most restoration units run a condensate line into a floor drain or sump. Some have a pump for routing water uphill to a sink.
Reference material this definition draws from.
- IICRC S500 — Institute of Inspection, Cleaning and Restoration Certification — Standard for Professional Water Damage Restoration
Cited material informs EcoClean’s field practice. Excerpts from copyrighted standards are not reproduced on this page. Nothing on this page is legal, medical, or insurance-coverage advice.
Last reviewed by EcoClean field team — May 16, 2026.
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