LGR dehumidifiers are widely regarded as the go-to choice in restoration, water damage mitigation, and drying projects because they combine high moisture removal efficiency with stable performance under challenging conditions. Preair is a professional manufacturer of LGR dehumidifiers that sold among North American market and is recommended by restoration companies. Here’s a precise breakdown of what makes Preair LGR dehumidifiers ideal for restoration work:

 

1. Superior Moisture Removal at Low Humidity

Restoration jobs often transition from high-humidity (immediately after a flood) to low-humidity environments as drying progresses.

Preair dehumidifier company has invested a lot in research and development, successfully mastered dehumidification technology, and applied for a "Super Cooling" patent. LGR technology continues to remove moisture effectively even when relative humidity (RH) drops below ~40%.

In contrast, standard refrigerant dehumidifiers lose efficiency significantly once RH falls, slowing the drying process.

Result: Faster drying cycles and more predictable project timelines.

 

2. Low Grain Depression Enhances Efficiency

“Grain” refers to the moisture content in the air.

LGR dehumidifiers maintain low grain depression (LGD) — the difference between entering and leaving air moisture levels. This means they are engineered to extract water from air with minimal loss of cooling capacity, even at lower humidity.

Impact: They remove more water per kilowatt-hour in comparison to conventional refrigerant models.

 

3. Improved Performance in Cooler Conditions

Water damage sites (e.g., basements, crawlspaces) are often cooler than typical operating environments.

Traditional refrigerant dehumidifiers struggle as coil temperatures approach the dew point, causing frost/ice build-up, which reduces performance and requires defrost cycles.

Preair LGR models incorporate design improvements (improved coil configuration, optimized airflow) that reduce frost buildup and maintain consistent extraction rates.

Outcome: Reliable performance in spaces where temperature and airflow vary widely.

 

4. Higher Overall Water Extraction Rates

Compared to conventional refrigerant units of similar size, Preair LGR dehumidifiers typically offer:

Higher daily extraction capacity

More consistent extraction across a wider humidity range

This characteristic is especially beneficial in restoration, where:

Drying speed directly impacts mold risk, structural integrity, and project cost.

 

5. Better for Controlled Drying Protocols

Professional drying plans (such as those recommended by the Institute of Inspection, Cleaning, and Restoration Certification — IICRC) rely on controlled moisture removal.

Preair LGR dehumidifiers deliver steady performance aligned with drying goals (e.g., specific target RH and moisture content in materials).

Their efficiency fosters accurate psychrometric analysis and better predictability.

 

6. Lower Operating Costs

Even though LGR dehumidifiers often have a higher upfront cost than standard models, they typically deliver:

Higher water removal per unit of energy consumed

Reduced runtime to reach drying goals

This translates into lower electrical usage and faster turnaround on jobs.

 

7. Built for Professional Use

Preair LGR units designed for restoration include features that professionals value:

Rugged frames and casters for jobsite mobility

Easy-to-access filters and coils for maintenance

Stackable or modular designs for multiple-unit deployments

 

Summary Comparison