What can be a result of mixing different HVAC setups, like Direct Expansion and chilled-water systems?

Mixing different HVAC setups, such as Direct Expansion (DX) systems and chilled-water systems, can lead to difficulty in maintaining consistent humidity levels. Each system operates differently with unique temperature and humidity control mechanisms. A Direct Expansion system typically dehumidifies air as it cools, while a chilled-water system relies on cooling water circulated through coils to lower the air temperature without dehumidification necessarily being a priority.

When these systems are combined, their interactions can create challenges. For instance, if one system is over-cooling while the other is not effectively controlling humidity, this may lead to fluctuations in humidity levels within the space. Maintaining balance becomes more complex because the systems do not inherently complement each other in terms of moisture management. As a result, it can be difficult to achieve the desired indoor air quality and comfort conditions, making maintaining consistent humidity a significant challenge in such mixed HVAC setups.