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What Is an Lgr Dehumidifier and Why Is It Used in Restoration?

Last updated October 26, 2026

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The short answer

How an Lgr Dehumidifier Works

An LGR dehumidifier pulls humid air through a cold coil, causing moisture to condense into a collection tank or drain. Unlike standard refrigerant dehumidifiers, it maintains effectiveness in lower temperatures, which is common after a water event. The dried air is then reheated and returned to the room, gradually lowering the overall humidity level.

This process is gentle compared to high-heat drying methods. It helps dry out wood, drywall, and fabrics without causing them to crack or shrink. The equipment is often left in place for days, running continuously to bring moisture levels down to a stable range.

  • Pulls moisture from the air using a cold coil
  • Works in cooler conditions than standard units
  • Releases warm, dry air back into the space
  • Runs continuously for extended periods
  • Helps prevent swelling, warping, and mold growth

Why Restoration Pros Use It

After a pipe leak, flood, or roof failure, water soaks into building materials and personal belongings. Simply wiping surfaces is not enough; the hidden moisture in walls, floors, and furniture needs to be drawn out. An LGR dehumidifier does this by lowering the overall humidity, which encourages water to evaporate from those materials.

This approach reduces the risk of secondary damage, such as wood rot, rust on metal items, and musty odors. It also creates an environment less favorable for mold growth. The pros often combine several LGR units with air movers to speed up evaporation while keeping the process controlled.

When an Lgr Dehumidifier Is Needed

You might need an LGR dehumidifier if your home has been through a water damage event like a burst pipe or a roof leak. It is especially useful when the damage is extensive and drying needs to happen over days, not hours. The unit is also helpful in humid climates where natural drying is slow.

If you live in a hot, humid climate, you know that muggy weather can make water damage worse. After any significant water intrusion, the air can stay damp for a long time without help. Using a dehumidifier helps the structure dry out more thoroughly, reducing the chance of lingering issues.

  • After a pipe burst or supply line leak
  • Following a flood or storm surge
  • When a roof leak has soaked insulation
  • If you notice a musty smell or damp spots
  • During humid seasons when air drying is ineffective

What to Expect During Restoration

When the pros set up an LGR dehumidifier, they place it in the affected area and run a drain hose to a sink or outside. They also position air movers to keep air circulating. The equipment runs continuously, and the pros check moisture levels regularly to track progress.

The drying process can take several days, depending on how much water was involved and what materials are wet. You might notice the unit collecting many gallons of water per day. The pros will adjust the setup as needed, moving the dehumidifier to different spots to target the dampest areas.

How You Can Help the Process

You can speed up drying by removing wet rugs, furniture, and other items from the affected area, if it is safe to do so. Open closet doors and cabinet doors to let air reach hidden spaces. Also, turn off any standing water sources like a leaking appliance or a broken pipe, but only if you can do so safely.

Keep windows closed while the dehumidifier runs, because open windows let humid outdoor air in. Check the unit's water collection tank regularly if it is not connected to a drain. If you feel unwell or notice unusual symptoms, see a doctor.

  • Remove wet items from the room
  • Open doors to closets and cabinets
  • Shut off the water source if safe
  • Keep windows and doors closed
  • Check the collection tank or drain line

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Frequently asked questions

How long does an LGR dehumidifier need to run?

It often runs for several days, sometimes a week or more, depending on the extent of the water damage. The pros monitor humidity levels and stop when the materials are dry. Running it longer than needed can waste energy, so they use moisture meters to decide.

Can I rent an LGR dehumidifier for my home?

Yes, you can rent one from equipment rental places or some hardware stores. However, using the right size and setup matters. A unit that is too small will not dry effectively. Many homeowners prefer to let the pros handle the equipment and the drying process.

Does an LGR dehumidifier remove mold?

No, it only removes moisture from the air. It does not clean or kill mold. If mold is already growing, you need a mold professional to handle removal. After the mold is gone, the dehumidifier helps prevent new growth by keeping the area dry.

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