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Direct digital control (DDC) in HVAC systems can have several disadvantages, including high initial costs for installation and equipment. Additionally, DDC systems may require specialized training for personnel to operate and maintain them effectively, leading to potential operational challenges. Furthermore, reliance on technology can lead to vulnerabilities, such as system failures or cybersecurity threats, which can disrupt HVAC operations. Lastly, integrating DDC with existing systems can be complex and may require significant modifications.

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