At the CDI (Climate by Design International) booth at AHR 2025, Tony Mormino spoke with Mike Peterson, the company’s newly appointed COO, to discuss desiccant dehumidification. In this engaging conversation, they covered how desiccant technology works, where it’s used, and what sets CDI apart in the industry.
Desiccant dehumidification is essential in applications where traditional cooling-based dehumidification isn’t enough. Unlike standard methods that rely on condensation to remove moisture, desiccant systems use a desiccant rotor, primarily made of silica gel, to adsorb moisture from the air. This process helps achieve ultra-low humidity levels—sometimes as low as -100°F dew point, a level so dry that standard humidity sensors can’t even measure it.
How It Works
A desiccant dehumidifier operates using two airstreams. The process airstream (about 75% of the system) pulls in humid air, where the desiccant material captures the moisture. The regeneration airstream (the remaining 25%) then heats the desiccant wheel, releasing the moisture and expelling it outside. This cycle allows for continuous drying, making it ideal for applications where strict humidity control is required.
Historically, gas-fired heating has been the primary method for regenerating the desiccant wheel, but with electrification and decarbonization trends, electric heating is becoming more common. Steam and waste heat from industrial processes can also be used, depending on the application.
Key Applications
Desiccant dehumidification is used in industries where maintaining low humidity is critical. Lithium battery manufacturing, for example, requires air at a -70°F dew point to prevent moisture contamination that could degrade battery performance. Surgical suites rely on precise humidity control to maintain sterile conditions, while ice arenas use desiccant systems to prevent excess condensation that can create safety hazards. Food processing facilities also benefit from moisture control to maintain product quality and meet hygiene regulations.
As a rule of thumb, desiccant systems are most effective when dew points drop below 45°F. In some cases, they work alongside traditional cooling-based dehumidification to remove the last traces of moisture that other systems can’t handle.
CDI’s Approach
CDI offers three levels of desiccant dehumidification solutions. Their standard units provide ready-made options for common applications, while their configurable units add flexibility with additional features. For highly specialized environments, CDI develops fully custom solutions, working closely with clients to meet their exact humidity control needs.
What truly sets CDI apart is its engineering expertise and commitment to quality. Their systems are built to last, particularly for industrial and food-grade applications. The company prides itself on integrity—ensuring that they deliver the dry air conditions they promise. With over 350 years of combined experience on their applications engineering team, CDI understands how to design solutions that work.
Why Experience Matters
With the growing demand for desiccant dehumidification in battery manufacturing and other industries, new players are entering the market. As Tony pointed out, anyone can manufacture a unit that looks good on the outside, but true quality comes from engineering, precision, and experience.
One of the best ways to understand what sets CDI apart is to visit their state-of-the-art manufacturing facility in Owatonna, MN. Seeing the engineering, production, and rigorous testing processes firsthand makes it clear why CDI is a leader in the industry.
Watch the Full Interview
For the complete discussion between Tony Mormino and Mike Peterson, watch the video to see CDI’s expertise in action.
