Mechanical engineering involves the understanding of the operation of heating ventilation and air conditioning systems in order to support the internal operations of a building. The systems and design must be flexible enough to accommodate varying occupancy under varying outdoor temperature and humidity conditions and must provide constant comfort while at the same time, offering optimum energy efficiency which is maximized for normal building operations and occupancies. Optimum comfort includes the system’s ability to, not only deal with the load and changing occupants but also to ensure the space is free from excess carbon dioxide, moisture, dust, airborne bacteria and contaminants. Systems can be complex and are customizable based on the specific usage of a building. Specialty designs include laboratories, healthcare, educational, entertainment and retail uses. A major consideration of DVL’s approach to design is ease of maintenance and ease of usage for occupants to operate the system.