REM/Design™ is developed specifically with the needs of homebuilders, remodelers, energy consultants and designers in mind. REM/Design™ calculates heating, cooling, hot water, lights and appliance loads, consumption and costs for single and multi-family designs in over 600 North American cities. NORESCO continually upgrades REM/Design™ to become more applicable for existing homes. Look for future updates of new reporting, streamlined inputs and a web based application. This Windows®-based software automatically analyzes the energy and economic performance of numerous energy design features including envelope insulation, air leakage control, duct leakage control, active and passive solar systems, heating and cooling equipment, mechanical ventilation and more. In addition to calculating energy performance, REM/Design™ sizes heating and cooling equipment, and automatically determines compliance with the International Energy Conservation Code for both the prescriptive and performance compliance paths. Two levels of input have been designed for REM/Design™ users: Simplified and Detailed. Simplified inputs use general building design characteristics (e.g., house type) and built-in algorithms to determine building shell areas and other characteristics. Detailed inputs provide the user greater control over building specifications. Inputs include opaque wall construction details, window conduction and solar gain values, HVAC efficiencies, duct system characteristics, passive and active solar design features, infiltration rates (measured or estimated). REM/Design™ helps you evaluate and promote the most cost-effective energy features for new home construction. The software analyzes the energy and economic performance of traditional and innovative design features, including active and passive solar systems, infiltration and duct leakage reduction packages, high-performance windows, efficient heating and cooling equipment, and panelized construction. REM/Design™ identifies cost-effective energy improvements to existing homes. Using economic criteria that you specify, it automatically ranks energy efficiency improvements from the list of measures you’ve created. Once the treatments (energy efficiency improvements) and the rule base (i.e., if existing ceiling insulation is R-11, install R-19 to achieve R-30) have been created, they can be saved and used on future projects. The software also offers utility bill analysis, which facilitates calibration of the model.