Commercial Dehumidifier Rental
Trailer-mounted 5,000 CFM desiccant dehumidifiers, high-capacity LGR units, and the generators, air movers and HEPA scrubbers that go with them — for warehouses, schools, hospitals, high-rises and construction sites across NJ, NY, CT, PA, NC, SC & FL.
Restoration Equipment Supply rents commercial dehumidifiers for large water losses, construction drying and humidity control: portable low-grain refrigerant (LGR) units for occupied floors and trailer-mounted 5,000 CFM desiccant dehumidifiers with an onboard generator for big, cold or unpowered buildings. Call (973) 685-4030 for 24/7 emergency dispatch and same-day delivery.
- Desiccant Dehumidifiers
- LGR Dehumidifiers
- Air Movers
- HEPA Air Scrubbers
- Portable Air Scrubbers
- Negative Air Machines
- HEPA Vacuums
- Generators
What is commercial dehumidifier rental?
Commercial dehumidifier rental is short-term use of industrial-capacity drying equipment that a building owner, general contractor or restoration firm can’t justify owning. The machines are sized to whole floors and buildings, not single rooms, and they arrive with the ducting, power and monitoring a large job needs.
Most commercial jobs fall into one of three needs: an emergency water loss that must be dried before mold and secondary damage set in, a construction schedule that is waiting on slabs, drywall or coatings to dry, or ongoing humidity control in a space whose HVAC can’t keep up.
- Two technologiesPortable LGR (refrigerant) units and trailer-mounted desiccant units
- Hero unit5,000 CFM desiccant on a trailer with its own 27 kW diesel generator
- CoverageNJ, NY, CT, PA, NC, SC & FL from our Piscataway, NJ base
- Response24/7 dispatch, same-day delivery for emergencies
LGR or desiccant: which commercial dehumidifier do I need?
Rent LGR units for warm, occupied or finished commercial spaces with normal 70–90°F air; rent a desiccant when the building is large, cold, unheated, unpowered, or you need the lowest possible dew point. Many large losses use both: a desiccant trailer for the bulk air and LGRs in rooms the duct can’t reach.
The difference is physics. A refrigerant dehumidifier condenses water on a cold coil, so it slows down as the air gets cooler and drier. A desiccant unit adsorbs moisture onto a silica-gel wheel and keeps pulling water at low temperatures and low humidity where a coil stops working.
| Factor | Portable LGR (refrigerant) | Trailer-mounted desiccant |
|---|---|---|
| How it’s rated | Pints per day (AHAM), e.g. 70–165 PPD | Process airflow (CFM), e.g. 5,000 CFM |
| Best conditions | Warm air, roughly 70–90°F | Cold, unheated, or already-dry air; low dew point targets |
| Power | Standard 115V circuits, about 5–10 A each | Onboard 27 kW diesel generator, or 240V shore power |
| Placement | Inside the space, room by room | Outside on the trailer, ducted in through 17.5″ ducts |
| Typical jobs | Offices, retail, classrooms, finished floors | Warehouses, gyms, high-rise floors, new construction, flood response |
| Units for a big floor | Many (each covers a limited volume) | Often one trailer per large chamber |
See the full models and pints-per-day ratings on our dehumidifier rental page, or go straight to desiccant dehumidifier rental.
The 5,000 CFM Desiccant Trailer
One towable machine that dries a large commercial chamber on its own power. It parks outside, ducts into the building, and starts pulling water the day it arrives — even when the utility power is off.
- Reaches lower dew points than refrigerant units, including in cold or unheated buildings
- 5 in. WC external static pressure for long duct runs into upper floors and deep interiors
- Sound-attenuated cabinet: 64 dB at 25 ft for occupied campuses and urban sites
- Generator waste heat is used for reactivation, cutting fuel use
| Spec | Value |
|---|---|
| Process airflow | 5,000 CFM |
| Moisture removal | 158 lbs/hr (AHAM) — about 3,790 lbs, or roughly 455 gallons, per 24 hours at rated conditions |
| Onboard generator | 27 kW diesel, 240V |
| Fuel | About 2 gal/hr · 200 gal tank · 3+ days runtime · 300 gal secondary containment |
| Shore power option | 240V single-phase, 60 Hz, 83 A |
| Ducting | 2 × 17.5″ process inlets · 1 × 17.5″ outlet · 5 in. WC external static |
| Footprint | 8′6″ L × 6′6″ W × 8′3″ H · 4,450 lbs dry / 5,860 lbs fueled |
| Noise | 64 dB at 25 ft |
What size commercial dehumidifier do I need?
Size a desiccant by air changes per hour (process CFM) and size LGR units by pints per day. Both start with the cubic volume of the drying chamber: length × width × ceiling height.
Desiccant: CFM and air changes
The IICRC S500 method sets a target number of air changes per hour (ACH) by class of water: about 1 ACH for Class 1, 2 ACH for Class 2 and 3 ACH for Class 3. Required process CFM = chamber volume × ACH ÷ 60.
| Class of water | Target ACH | Max chamber volume | Example at 20 ft ceilings |
|---|---|---|---|
| Class 1 (minimal wetting) | 1 | 300,000 cu ft | about 15,000 sq ft |
| Class 2 (carpet, pad, walls under 24″) | 2 | 150,000 cu ft | about 7,500 sq ft |
| Class 3 (ceilings, walls, insulation saturated) | 3 | 100,000 cu ft | about 5,000 sq ft |
LGR: pints per day
For low-grain refrigerant units, S500 divides chamber cubic feet by a class factor — 100 for Class 1, 50 for Class 2, 40 for Class 3 — to get the total AHAM pints per day you need. Then divide by each unit’s AHAM rating.
Worked example: a 10,000 sq ft office floor with 10 ft ceilings is 100,000 cu ft. At Class 2 that needs 2,000 AHAM pints/day — about 16 LGR units rated 125–130 PPD. The same chamber sits inside the 150,000 cu ft Class 2 range of a single 5,000 CFM desiccant trailer. That gap in unit count, power circuits and labor is why big commercial losses usually go desiccant.
Run your own numbers in the dehumidifier sizing calculator or the full equipment calculator, then call — our team confirms every package from your readings before it ships.
What power does a commercial dehumidifier need?
Portable LGR units run on standard 115V outlets and draw roughly 5–10 amps each, so a large LGR setup needs many separate circuits. The desiccant trailer carries its own 27 kW diesel generator, so it needs no building power at all — or it can run on 240V single-phase shore power where that’s available.
- Flooded or storm-hit buildings with utility power off: the trailer runs grid-independent, and we add a generator rental for LGRs, air movers and scrubbers inside.
- Size support generators with our generator calculator; temporary power should follow NFPA 70 (NEC) Article 590 for temporary installations.
- On construction sites, OSHA requires ground-fault protection on 120V temporary receptacles (29 CFR 1926.404).
- Never run a fuel-burning generator inside the building; the trailer and generators stay outdoors and duct or cable in.
24/7 Emergency Dispatch
Water on the Floor
Right Now?
Same-day emergency delivery. A real person answers, never a machine.
(973) 685-4030- Dispatch 24/7
- Same-Day Emergency Delivery
- Delivered, Set & Monitored
Where is commercial dehumidification used?
Anywhere the volume of air, the cold, or the deadline is too big for room-sized equipment.
Warehouses & Distribution
High ceilings mean huge volume. One or more 5,000 CFM trailers dry slab, racking areas and stored goods after roof leaks, sprinkler discharges and floods.
Schools & Universities
Gyms, auditoriums and classroom wings dried on a tight calendar, with a quiet trailer outside and HEPA air scrubbers inside.
Hospitals & Healthcare
Drying inside infection-control barriers, paired with negative air machines to keep dust and spores out of patient areas.
High-Rises & Multifamily
Trailer at street level, lay-flat duct up the stairwell or a window, and LGRs on floors the duct can’t reach after riser or sprinkler breaks.
New Construction Drying
Construction dehumidifier rental to dry slabs, drywall compound and framing before flooring and finishes go in, especially in cold months.
Coatings & Paint Cure
Holding dew point down so surfaces stay above it — the common coatings rule is at least 5°F above dew point — for tank linings, floors and blasting.
Flood & Storm Response
Hurricane, nor’easter and river-flood losses where power is out and dozens of buildings need drying at once. See water damage equipment rental.
Mold Prevention
Fast drying is the main way to stop mold; once growth is present, add containment from our mold remediation equipment rental line.
Retail, Hotels & Offices
Portable commercial dehumidifiers that roll through doorways and run on house power so the rest of the building stays open.
How does emergency commercial dehumidifier rental work?
Call (973) 685-4030 any hour. A real person answers, sizes the job with you, and dispatches equipment — same-day delivery for emergencies.
Call 24/7
Tell us the address, square footage, ceiling height, what got wet, and whether the building has power.
We Size the Package
Desiccant CFM or LGR pints per day by class of water, plus air movers, scrubbers and generators to match.
Same-Day Delivery
Trailers and portable units rolled to site, with ducting, hoses and cords for the layout you described.
Set, Dry, Adjust
Add, swap or extend equipment as moisture readings drop, then one call schedules pickup.
Build the Full Drying Package
LGR Dehumidifiers
70 to 165 pint-per-day units for occupied floors and finished rooms.
See Dehumidifier Rentals
Air Movers
Drive evaporation from floors and walls so dehumidifiers can remove it.
See Air Mover Rentals
Generators
Job-site power for LGRs, air movers and scrubbers when the grid is down.
See Generator Rentals
Our Inventory
Every desiccant, LGR, air mover, scrubber and generator model we carry.
Browse the InventoryCommercial Dehumidifier Rental FAQ
Where can I get emergency commercial dehumidifier rental?
Restoration Equipment Supply runs 24/7 emergency dispatch from Piscataway, NJ with same-day delivery across New Jersey, New York, Connecticut, Pennsylvania, North Carolina, South Carolina and Florida. Call (973) 685-4030 with the building size and whether it has power, and we’ll stage desiccant or LGR units for the job.
Is there commercial dehumidifier rental near me?
If your site is in NJ, NY, CT, PA, NC, SC or FL, yes. We deliver trailer-mounted desiccants and portable commercial dehumidifiers directly to the job. See our service areas →
What is the biggest dehumidifier I can rent?
Our flagship is a trailer-mounted 5,000 CFM desiccant dehumidifier that removes 158 lbs of water per hour (AHAM) and runs on its own 27 kW generator. For warehouses and disaster response we deploy multiple trailers on one site.
Do you rent portable commercial dehumidifiers?
Yes. Commercial portable dehumidifier rental covers LGR units from about 70 to 165 AHAM pints per day that run on 115V and roll through a standard door — see the size chart on our dehumidifier rental page.
Can I rent a dehumidifier for a construction site?
Yes. Construction dehumidifier rental is used to dry slabs, drywall and framing before finishes, and to control humidity for coatings. The desiccant trailer is grid-independent, so it works before permanent power is energized.
Desiccant or refrigerant for a cold or unheated building?
Desiccant. Refrigerant and LGR units lose capacity as air cools because they rely on condensation on a cold coil; a desiccant wheel keeps adsorbing moisture in cold, dry air and reaches lower dew points.
How many commercial dehumidifiers do I need?
For desiccants, multiply the chamber’s cubic feet by the target air changes (1–3 per hour by class of water) and divide by 60 for the CFM. For LGRs, divide cubic feet by 100, 50 or 40 (Class 1–3) for total pints per day. Use our dehumidifier sizing calculator, then we confirm.
Do you also rent other commercial restoration equipment?
Yes — air movers, HEPA air scrubbers, negative air machines, HEPA vacuums, heaters, moisture meters and generators, so one call covers the whole drying and containment package. Browse the inventory →
Updated October 2026 · Reviewed by the Restoration Equipment Supply dispatch team
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