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Humidity Control I and II: Tips for HVAC Design and Practical Solutions to Existing Problems

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Course Length: 6 hours

Sooner or later, every HVAC designer and facility manager comes up against a problem created by moisture and/or excessive humidity in their buildings. Mold on walls or in schools after vacations, mold in hospital operating suites, mold in military barracks or in college dormitories, dripping supply air diffusers in restaurants during the summer, musty odors in basements or odors from HVAC systems, or perhaps just that damp, mugginess first thing in the morning, as the AC system starts up. All of these symptoms indicate shortcomings in humidity control.

This six-hour course consists of two, three-hour modules. Humidity Control I explains how humidity problems can be easily avoided in new designs by simple and effective humidity specifications and use of dedicated outdoor air systems that keep ventilation air dry. Humidity Control II describes classic problems and solutions for existing buildings when there may be little or no budget for different equipment or controls.

The instructors have a combined experience of more than 50 years of guiding new project designs through application engineering and through troubleshooting nasty, contentious, and expensive real-world problems in spite of limited budgets and difficult occupant requirements. Participant discussion will feature prominently in this course. This six hour course is best for those who like to dig in and share experiences with their peers in order to find cost-effective and practical solutions for real-world humidity control.

Recommended Reference

Humidity Control Design Guide for Commercial and Institutional Buildings

Course Instructor

Mark Nunnelly, P.E., Member ASHRAE, CxA

How Can I Register for This Course?

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Additional Information

All courses and webinars are available for Chapter and In-Company Programs. They may be periodically scheduled for the Winter and/or Annual Conference Education Programs, as well as the Online Courses Series.

Chapters or Companies: Contact Karen Murray, Manager of Professional Development ( or 678-539-1146), to schedule an ALI seminar, course, or webinar at your organization or event.

Availability: Check the various offerings listed under Professional Development > All Instructor-Led Training to see if this course is being offered at an upcoming event or as a webinar.