ASHRAE 139-2022 is the technical standard for the Method of Testing for Rating Desiccant Dehumidifiers Utilizing Heat for the Regeneration Process. It provides a recognized testing framework for evaluating this type of dehumidification equipment in a consistent way, which is important when comparing products, supporting specifications, or reviewing performance data. For HVAC engineers, manufacturers, consultants, and facility teams, ASHRAE 139-2022 offers a dependable reference for engineering documentation and technical review where desiccant dehumidification is part of the building system.

What does ASHRAE 139-2022 cover?

This ASHRAE standard establishes a method of testing used to rate desiccant dehumidifiers that rely on heat for regeneration. As a standard, it serves as a recognized technical benchmark rather than general guidance, helping align how performance is measured and reported. Buyers typically use ASHRAE 139-2022 when they need a consistent basis for product comparison, specification writing, or technical evaluation. It is especially relevant where dehumidification performance affects HVAC design, humidity control, and overall building system assessment.

Where is ASHRAE 139-2022 used?

ASHRAE 139-2022 is commonly used in HVAC equipment development, product testing, and building systems work where desiccant dehumidifiers are considered. It may support manufacturers, test laboratories, consultants, and QA/QC personnel who need a repeatable rating method for equipment using heat-based regeneration. It is also useful for engineers and facility professionals reviewing humidity control strategies in commercial buildings, critical spaces, or other conditioned environments where moisture management matters to operations and performance.

Why is ASHRAE 139-2022 important?

ASHRAE 139-2022 matters because it helps create consistency in how desiccant dehumidifiers are tested and rated. That consistency supports clearer product comparison, stronger technical documentation, and more reliable specification decisions. For project teams, it can reduce uncertainty during procurement, commissioning, and equipment review by providing a common reference point for performance claims. In practice, that makes ASHRAE 139-2022 valuable for engineering reference, quality control, and building performance decisions involving humidity management.

• Testing method for heat-regenerated desiccant dehumidifiers
• Recognized ASHRAE standard for rating and comparison
• Useful for HVAC equipment specification and review
• Supports laboratory, QA/QC, and technical documentation work
• Relevant to humidity control and building performance evaluation