Commercial Dehumidifier Rental Cost

Frequently Asked Questions

How much does commercial dehumidifier rental cost for water damage drying?

Commercial LGR (Low-Grain Refrigerant) dehumidifiers for water damage drying rent for $60–$120 per day or $300–$600 per week per unit. Most water damage projects require 2–6 units running for 3–7 days, putting the typical equipment rental cost at $900–$5,040 for the drying phase alone. Restoration companies typically include equipment costs in their overall project quote — daily equipment rates are their cost-of-goods, and most quote all-in rather than itemizing per-unit per-day. If you are renting independently (Category 1 event, DIY drying), call a drying equipment company rather than a consumer equipment rental chain — consumer dehumidifiers from Home Depot or similar are rated 30–50 pints/day vs. 150–250 pints/day for commercial LGR units.

What is an LGR dehumidifier and why is it required for water damage drying?

LGR (Low-Grain Refrigerant) dehumidifiers are engineered specifically for structural drying applications. They use a pre-cooling circuit that allows them to remove moisture efficiently even at lower relative humidity levels (down to 40% RH) — a critical capability because effective structural drying requires pushing humidity levels below where the standard refrigerant cycle becomes inefficient. Consumer dehumidifiers become ineffective below 70% RH and stop removing meaningful moisture. IICRC S500 requires equipment capable of achieving structural dry standards — consumer units do not meet this standard. LGR units also remove 150–250 pints of water per day vs. 30–50 pints for consumer units, completing structural drying in 3–7 days vs. 3–5 weeks with consumer equipment.

How many dehumidifiers do I need for my water damage event?

IICRC S500 equipment minimums for residential drying: Class 1 (minimal porosity, limited area) — 1 LGR dehumidifier per 500–600 sq ft of affected floor area. Class 2 (significant porosity — wet carpet, drywall) — 1 dehumidifier per 300–400 sq ft. Class 3 (heavy wet saturation including walls to ceiling) — 1 per 300 sq ft plus additional air scrubbers. Example: a 400 sq ft flooded basement at Class 2 requires 1–2 commercial dehumidifiers. The same space with saturated walls and ceiling (Class 3) requires 1–2 dehumidifiers plus 2–3 air scrubbers. Air movers (floor fans) are separate from dehumidifiers and are additionally required at 1 per 50–60 sq ft of wet surface to create surface airflow.

Can I use a store-bought dehumidifier from Home Depot instead of renting commercial equipment?

For water damage drying, store-bought consumer dehumidifiers are inadequate. The core problem: consumer units remove 30–50 pints per day at 80°F and 60% RH — but they become dramatically less effective as humidity drops below 70%, which is exactly where structural drying must occur. A 400 sq ft basement at Class 2 water damage contains 500–800 gallons of absorbed moisture in materials — requiring 15–25+ consumer dehumidifiers running simultaneously to match one commercial LGR unit. Consumer equipment also produces no calibrated moisture documentation, which your insurance adjuster requires to approve the drying phase of your claim. Use consumer equipment only for ongoing humidity maintenance in dry, undamaged spaces — not for active water damage drying.