We built software to control temperatures and humidities, to control the analyzer sampling systems, and to provide the graphical user interface for all monitoring activities. We also helped build simulation models to predict critical variables such as CO2 levels.
The software was installed and used for the project. This project also inspired our research on HVAC systems, funded by NIST.
For further information
A presentation made by Greg Stanley to the National Space Society North Houston (pdf) on May 12, 2018, provides a retrospective on Biosphere 2, with pictures, background information, and results of the overall experiment. An earlier 2003 presentation made to NASA Johnson Space Center (pdf) provided a less comprehensive overview, focusing more on details of the G2-based real time expert system used for monitoring.
The work also inspired research leading to a government grant from NIST to study fault diagnosis in VAV (Variable Air Volume) systems, an advanced (but failure-prone) form of HVAC. The final report on that HVAC diagnostics study can be found at NIST Final Report: A New Methodology for Fault Detection Observers in VAV Systems .