In addition to its circulation collection, this 30,000 SF historic library also houses art on paper and canvas, historic documents, and antique furniture — all of which are susceptible to temperature and humidity fluctuations. Key aspects of the project included complete removal and replacement of the existing HVAC systems with two (2) Central Constant Volume Systems consisting of central steam generators & humidification coils to keep space at proper humidity levels during the heating seasons. For dehumidification, a high-efficiency, low turndown, air-cooled condenser with low turndown capacity control, individual refrigerant circuits, zoned reheat coils, and central boiler plant was used.