Most challenges with the HVAC system at the site centered around the age of the equipment which ultimately included controllability. Rooftop air handlers originally were packaged with onboard controls that only allowed for control via physical, hardwired connections. Our virtual engineer Hank discovered early on the controllability issue put severe limits on overall savings and system modification – Limiting overall savings to just 63% of our calculated reduction.
Typical building automation strategies would suggest replacing the entire control system as it was approaching 18-years old. After running a payback analysis on the entire system, we discovered only replacing key controllers would net a 16-month payback with only $6,000.00 of capital expenditure.