Albuquerque | El Paso | Phoenix | Tucson

Humidity Control Technology Selection Guide

A practical reference to help match humidity control technologies with the right application, performance requirements, and operating conditions.

Selecting the right humidity control technology starts with understanding the application—not the equipment. Required dew point, ventilation rates, moisture loads, available utilities, and energy goals all influence the best solution.

This guide provides a high-level comparison of common humidification and dehumidification technologies. Use the interactive graphics below to explore each technology’s typical operating range, applications, advantages, and limitations.

What's Your Goal?

Remove Moisture or Add Moisture?

DX Cooling

Typical Dew Point Range:
55-50°F

Best For:

  • Offices
  • Schools
  • General Commercial Buildings

Advantages:

  • Lowest first cost
  • Familiar technology

Limitations:

  • Limited humidity control at part load

Products:

DX + Hot Gas Reheat

Typical Dew Point Range:
50-43°F

Best For:

  • Schools
  • Healthcare
  • Fitness centers
  • High ventilation applications

Advantages:

  • Improved humidity control
  • Reduced overcooling

Products:

Chilled Water

Typical Dew Point Range:
52-42°F

Best For:

  • Large Commercial Buildings
  • Healthcare
  • Higher Performance Facilities

Advantages:

  • Excellent humidity control
  • Ideal for central plant applications
  • Supports a wide range of cooling capacities

Products:

Liquid Desiccant

Typical Dew Point Range:
45–32°F

Best For:

  • Natatoriums
  • Dedicated dehumidification systems
  • High outdoor air applications

Advantages:

  • Removes moisture independently of sensible cooling
  • Maintains low dew points under varying load conditions
  • Ideal for applications with high latent loads

Products:

Solid Desiccant

Typical Dew Point Range:
40–0°F

Best For:

  • Laboratories
  • Pharmaceutical facilities
  • Industrial process applications

Advantages:

  • Achieves ultra-low dew points
  • Ideal for high latent load applications
  • Reliable performance in demanding industrial environments

Products:

Multi-Stage Desiccant

Typical Dew Point Range:
0°F to -150°F dew point

Best For:

  • Ultra-low dew point applications
  • Processes requiring moisture levels beyond conventional desiccant systems

Common Applications:

  • Lithium battery manufacturing
  • Semiconductor production
  • Aerospace manufacturing
  • Research laboratories
  • Specialty dry rooms
  • Highly controlled industrial processes

Advantages:

  • Achieves extremely low dew points
  • Designed for process-critical moisture control
  • Maintains ultra-dry environments for sensitive manufacturing

Limitations:

  • Specialized system design and application
  • Higher first cost and operating complexity
  • Typically not used for commercial comfort HVAC applications

Products:

Selection Starts With…

Before selecting equipment, define:

  1. Target dew point or humidity level
  2. Application requirements
  3. Available utilities (steam, chilled water, water quality)
  4. Operating priorities (first cost, energy, maintenance, control accuracy)

 

Once these design criteria are established, use the technology guides above and below to compare solutions.

Adiabatic

Typical Capacity:
Medium to High

Typical Humidification Method:
Evaporative (non-steam)

Best For:

  • Energy-efficient humidification
  • Facilities with evaporative cooling benefits

Common Applications:

  • Office buildings
  • Schools
  • Warehouses
  • Manufacturing facilities

Advantages:

  • Very low energy consumption
  • Provides evaporative cooling while humidifying
  • Lower operating costs than steam systems

Limitations:

  • Requires high-quality treated water
  • Cooling effect may not be desirable year-round
  • Greater water management requirements

Products:

Direct Steam Injection

Typical Capacity:
High

Typical Humidification Method:
Boiler steam

Best For:

  • Facilities with central boiler steam
  • Large commercial and institutional buildings

Common Applications:

  • Hospitals
  • Universities
  • Industrial facilities
  • Central utility plants

Advantages:

  • Fast response to changing humidity loads
  • High-capacity humidification
  • Simple when clean steam is readily available

Limitations:

  • Requires a boiler steam source
  • Steam quality must be appropriate for the application
  • Not practical where central steam is unavailable

Products:

Isothermal

Typical Capacity:
Low to High

Typical Humidification Method:
Self-generated steam

Best For:

  • Precise humidity control
  • Applications requiring stable room conditions

Common Applications:

  • Healthcare
  • Museums and archives
  • Laboratories
  • Commercial buildings

Advantages:

  • Precise humidity control
  • No cooling effect on the air stream
  • Available in electric, gas, and steam-to-steam configurations

Limitations:

  • Higher energy use than adiabatic systems
  • Requires a steam generation source
  • Operating costs depend on utility rates

Products:

Key Selection Factors

Start with the Application

Different building types have very different humidity requirements.

Define the Target Dew Point

Dew point—not just relative humidity—determines which technologies are capable of meeting the design conditions.

Understand the Latent Load

Outdoor air, occupancy, and process loads often drive equipment selection more than sensible cooling.

Consider Available Utilities

Steam availability, chilled water, and water quality can eliminate or favor certain technologies.

Evaluate Energy & Operating Costs

The lowest first cost is not always the lowest life-cycle cost.

Plan for Serviceability

Maintenance access, water treatment, and component replacement should be considered early in design.

Need Help Selecting the Right Solution?

Humidity control isn't one-size-fits-all. Our engineering team can help evaluate: design dew point, moisture loads, ventilation requirements, humidification and dehumidification, strategies, and product selection.
Contact the Varitec Team Below