Perform Energy and Cost Analyses : Calculate energy and demand savings using engineering calculations, bin analysis, spreadsheet tools, and/or simplified energy models; develop installed cost estimates and financial metrics (simple payback, ROI, NPV, IRR). Conduct Onsite Audits : Lead and support field investigations of building envelope, HVAC equipment, lighting, domestic hot water, plug loads, and building automation systems using hand tools, light meters, data loggers, and infrared cameras.