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The authors would like to thank all the external peer reviewers for their tremendous volunteer efforts and insightful reviews of our energy analysis work during the development of this report. Without their expertise in reviewing the energy efficiency measures covering envelope, lighting, HVAC systems, and service water heating systems, this document would be considerably less rigorous. The following experts peer reviewed an earlier draft of this report:

This project was conducted by Pacific Northwest National Laboratory (PNNL) in support of the U.S. Department of Energy's (DOE's) Building Energy Codes Program (BECP). DOE's BECP supports the upgrading of the building energy codes and standards, and the states' adoption, implementation, and enforcement of those codes and standards as they are incrementally upgraded. Building energy codes and standards set minimum requirements for energy-efficient design and construction for new and renovated buildings, and impact energy use and emissions for the life of buildings. They are part of a broader set of documents which govern the design and construction of buildings for the health and life safety of occupants. Energy codes and standards set a baseline for energy efficiency in construction by establishing minimum energy-efficiency requirements. Improving these documents generates consistent and longlasting energy savings.When the model energy codes and standards for buildings are being updated, BECP reviews the technical and economic basis of these documents. For commercial and multi-family high-rise residential buildings, which are the subject of this report, the basis for the energy codes is the ANSI/ASHRAE/IES 1 Standard 90.1.

iv including plug and process loads. Chapter 5 and Appendix C of this report present these energy simulation results as used in the cost-effectiveness analysis. The energy saving analysis of Standard 90.1 in the report described above utilized a suite of 16 prototype EnergyPlus building models. Prototypes were simulated in 17 climate locations representing all eight U.S. climate zones. The cost-effectiveness analysis in this report used a subset of prototypes and climate locations, providing coverage of nearly all of the changes in Standard 90.1 from the 2007 to 2010 edition that affect energy savings, equipment and construction costs, and maintenance, including conventional HVAC systems used in commercial buildings. Each prototype building was analyzed in each climate location for a total of 30 cost-effectiveness assessments. The following prototype buildings and climate locations were included in the analysis: Prototypes Climate Locations Small Office 2A Houston, Texas (hot, humid) Large Office 4A Baltimore, Maryland (mixed, humid) Standalone Retail 3A Memphis, Tennessee (warm, humid) Primary School 5A Chicago, Illinois (cool, humid) Small Hotel 3B Albuquerque, New Mexico (hot, dry) Mid-rise Apartment A primary input to the cost-effectiveness analysis was the incremental costs for the addenda to 90.1-2007 that were included in 90.1-2010. Of the 109 total addenda to 90.1-2007, 41 had quantified energy savings that were modeled in the 90.1-2010 energy savings analysis. The remaining addenda were not considered to have quantifiable savings, or do not affect the sections of 90.1 that directly impact building energy usage. Of the 41 addenda with quantified energy savings, 38 were modeled in the six prototypes and were included with the cost estimate. The remaining three addenda affect building systems that were not included in the prototypes. vi Table ES-1 Summary of Cost-effectiveness Analysis Prototype Climate Zone

This Technical Support Document (TSD) describes the process, methodology and assumptions for development of the 50% Energy Savings Design Technology Packages for Highway Lodging Buildings.This design guidance document provides specific recommendations for achieving 50% energy savings in highway lodging properties over the energy-efficiency levels contained in ANSI/ASHRAE/IESNA Standard 90.1-2004 (ANSI/ASHRAE/IESNA 2004a). These 50% savings design packages represent a further significant step towards realization of the U.S. Department of Energy's (DOE) net-zero energy building goal for new construction by the year 2025. DOE has previously supported the development of a series of 30% energy savings design guides, which were developed by a partnership of organizations, including the American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc. (ASHRAE), the American Institute of Architects (AIA), the Illuminating Engineering Society of North America (IESNA), the United States Green Buildings Council (USGBC), as well as DOE 1 .This report provides recommendations and user-friendly design assistance to designers, developers, and owners of highway lodging properties and is intended to encourage steady progress towards net-zero energy performance in these buildings. The design package provides prescriptive recommendation packages that are capable of reaching the 50% energy savings target for each climate zone, thereby easing the burden of the design and construction of highway lodging with exemplary energy performance.To develop the set of energy efficiency measure recommendations that meet, or exceed, the 50% goal, we used a highway lodging prototype, adapted from previous work for achieving 30% savings in the Advanced Energy Design Guide for Highway Lodging Buildings (AEDG-HL), to represent this class of buildings.We created baseline models from the prototype that are minimally code-compliant with ASHRAE 90.1-2004, and advanced models based on the recommended energy-efficient technologies. To determine the energy savings at different climate locations, we performed EnergyPlus simulation analyses. The simulation approach used is documented in this TSD, along with the characteristics of the prototype and assumptions of the baseline and advanced models.Finally, we assessed the cost effectiveness of the energy-efficient technologies recommended in the design package using the simple payback period method.Prescriptive packages of recommendations presented in the design package by climate zone include enhanced envelope technologies, interior and exterior lighting technologies, heating, ventilating, and airconditioning (HVAC) and service water heating (SWH) technologies, and miscellaneous appliance technologies. Final energy efficiency recommendations for each climate zone are included, along with the results of the energy simulations indicating a national-weighted average energy savings over all buildings and climates of 55.5% in comparison with the Standard 90.1-2004 as baseline.A cost estimate of the re...