Operating Sustainable Facilities
Run the building, then measure it
Operating sustainably is a discipline of continuous improvement: establish a baseline, find savings, implement, verify, and repeat. Candidates should know the energy hierarchy - reduce demand first (scheduling, setbacks, right-sizing), then improve efficiency (controls, economizers, retrofits), then supply cleanly (renewables, storage). Related concepts: building automation and controls, plug-load management, water efficiency and irrigation, green cleaning, IEQ monitoring, refrigerant management, preventive and predictive maintenance, continuous commissioning, and measurement and verification (M&V) against a documented baseline. Occupant engagement, green commuting programs, and waste diversion operations (recycling, composting, hauler contracting) round out the operating picture, with KPIs such as energy use intensity (EUI) and cost per square foot reported regularly.
Traps the exam sets
- Claiming savings without M&V against an adjusted baseline.
- Confusing kW (demand) with kWh (consumption), or EUI with total consumption.
- Applying setbacks to zones that must stay conditioned, or to equipment that cannot recover.
- Treating a recycling count as waste diversion while ignoring contamination and composting.
- Assuming a retrofit guarantees savings when schedules and setpoints were never corrected.
Worked example: EUI
A 50,000 sf building uses 4,000,000 kBtu in a year. EUI = 4,000,000 ÷ 50,000 = 80 kBtu/sf/yr. If the portfolio target is 65, the gap is 15 kBtu/sf/yr - roughly 750,000 kBtu, or about 19% - which becomes the retrofit and tuning scope. Rule of thumb: verify before you celebrate.