NEO Net Energy Optimizer® is an online SaaS energy modeling tool that streamlines whole building analyses of HVAC systems and energy conservation measures for commercial buildings with the versatility to support product comparisons, existing building energy audits and new construction from early design through construction. NEO uses default inputs from vetted industry standards (ASHRAE, COMNET, RS Means) to automate the modeling process. All inputs are customizable where additional details are known. NEO supports 40+ commercial building types (including mixed-use and multifamily) and 250+ operational and capital improvement measures coupled with automated ASHRAE Standard 90.1 and IECC baselines. NEO performs both an HVAC Life Cycle Cost Analysis to help users make faster, more-informed HVAC decisions and a Rating Analysis to empower users to evaluate the ROI of energy conservation measures to assist with specifying, designing and maintaining higher-performing buildings. NEO increases efficiency of product selection and design decisions by providing both energy savings and ROI information. NEO graphically reports results, generates downloadable input/simulation files, and creates CSV and MS Word documents detailing key model inputs and outputs. NEO is web-based, touch friendly, and requires no software installation.