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, 2024
- ASHRAE Online Bookstore
- Addenda
- Errata
- Return to Previous Page
- ANSI/ASHRAE/IES Standard 90.2-2024 [Go to Page]
- Contents
- Foreword
- 1. Purpose
- 2. Scope [Go to Page]
- 2.1 Buildings and Portions of Buildings Covered
- 2.2 Systems Covered
- 2.3 Exemptions. This standard does not apply to transient housing, such as hotels, motels, nursing homes, jails, dormitories, and barracks.
- 2.4 Health, Safety, and Welfare. This standard shall not be used to abridge any safety, health, or environmental requirements.
- 3. Terminology [Go to Page]
- 3.1 Definitions
- 3.2 Abbreviations and Acronyms
- 4. Administration and Enforcement [Go to Page]
- 4.1 Application
- 4.2 Authorization. Administrative requirements relating to construction permit requirements, enforcement, locally adopted energy standards, regulatory interpretations, claims of exemption, and rights of appeal are specified by the authority having ju...
- 4.3 Alternative Materials, Methods of Construction, or Design. The provisions of this standard are not intended to prevent the use of any material, method of construction, design, equipment, or building system not specifically prescribed herein.
- 4.4 Severability. If any term, part, provision, section, paragraph, subdivision, table, chart, or referenced standard of this standard shall be held unconstitutional, invalid, or ineffective, in whole or in part, such determination shall not be deeme...
- 4.5 Other Laws. The provisions of this standard shall not be deemed to nullify any provisions of local, state, or federal law. Where there is a conflict between a requirement of this standard and such other law affecting construction of the building,...
- 4.6 Referenced Standards. The standards referenced in this standard are part of the requirements of this standard to the prescribed extent of such reference. Where differences occur between the provision of this standard and referenced standards, the...
- 4.7 Normative Appendices. The normative appendices to this standard are part of the requirements of this standard.
- 4.8 Informative Appendices. The informative appendices to this standard, and informative notes located within this standard, contain additional information and are not requirements for compliance with this standard.
- 4.9 Construction Documents
- 4.10 Climate. Determine the climate zone for the location. For U.S. locations, follow the procedure in Section 4.10.1. For international locations, follow the procedure in Section 4.10.2.
- 5. Additions and Alterations [Go to Page]
- 5.1 Additions. Additions to existing dwelling units shall comply with either Section 5.1.1 or Section 5.1.2.
- 5.2 Alterations. Alterations to existing dwelling units shall be such that the altered dwelling unit uses no more energy than the existing dwelling unit prior to its alteration. Alterations to existing dwelling units shall comply with Sections 5.2.1 ...
- 5.3 Substantial Energy Alterations. Substantial energy alterations to existing dwelling units shall comply with the requirements of Section 5.2 and shall be planned, designed, and constructed to achieve the ERI by climate zone shown in Table 5-4.
- 5.4 Alteration Requirements. When existing dwelling units that do not have electric vehicle supply equipment (EVSE) installed or an EV-ready space, or that do not meet the requirements of Table 7-6, undergo a substantial energy alteration, considerat...
- 6. Performance Requirements [Go to Page]
- 6.1 The dwelling unit shall be planned, designed, and constructed to achieve the Energy Rating Index (ERI) and CO2e Rating Index (CRI) by climate zone shown in Table 6-1.
- 6.2 Renewable Power Utilization. When on-site power production or off-site power production is used to meet the ERI requirements of Section 6.1, the following requirements shall be met.
- 6.3 Off-Site Power Utilization When off-site power production is used, ERI shall be calculated in accordance with ANSI/RESNET/ICC 301 1 with the OPP in Equation 4.1.2 of ANSI/RESNET/ICC 301 replaced with OPPadj as calculated in accordance with Equati...
- 6.4 Energy Rating Index with Electric Vehicles. Energy utilized for EV charging shall be excluded from the ERI calculation.
- 6.5 Performance Verification and Compliance Reporting
- 7. Requirements [Go to Page]
- 7.1 Building Thermal Envelope Components
- 7.2 HVAC Systems
- 7.3 Indoor Environmental Quality
- 7.4 Service Water Heating
- 7.5 Lighting
- 7.6 Other Systems
- 8. Verification [Go to Page]
- 8.1 Minimum Provisions
- 8.2 Building Envelope Verification
- 8.3 Mechanical Systems Verification
- 8.4 Lighting Systems
- 8.5 Service Water Heating Systems
- 8.6 Other Mechanical Systems. Other regulated mechanical systems included in the proposed design shall be verified to match the proposed design and to be installed according to manufacturer instructions.
- 8.7 Renewable Energy Systems and Energy Storage Verification. When on-site power production, off- site power production, or energy storage is used for compliance, the following shall be verified:
- 8.8 Re-Inspection and Testing. Where any work or installation does not pass the initial test or inspection, the nonconforming work or installation shall be reported in writing to the AHJ, owner, and contractor, and the necessary corrections shall be ...
- 9. Reporting Requirements [Go to Page]
- 9.1 Compliance Reporting. The simulation program shall generate reports documenting compliance of the proposed design, and the owner or owner’s authorized agent shall deliver compliance reports to the authority having jurisdiction (AHJ) timely with...
- 9.2 Other Documentation
- 10. Normative References
- Normative Appendix A: Software Requirements [Go to Page]
- A1. Simulation Program [Go to Page]
- A1.1 The simulation program shall be approved by the rating authority and shall, at a minimum, have the ability to explicitly model all of the following:
- A1.2 The simulation program shall have the ability to produce hourly reports of energy use by energy source.
- A1.3 The simulation program shall be capable of performing design load calculations or using the output from ANSI/ACCA 2 Manual J 5 software to determine required HVAC equipment capacities and air and water flow rates in accordance with Section 7.2 f...
- A1.4 The simulation program shall be tested according to ANSI/ASHRAE Standard 140 29, Sections 7 and 8, except for Sections 7.2.3 and 8.2.2, and the results shall be furnished by the software provider.
- A1.5 The simulation program shall generate reports documenting compliance of the proposed design with Sections 7 and 6. Compliance documentation shall include the following information regarding the building, its site, and the simulation:
- A1.6 The simulation program shall incorporate the rule set from ANSI/RESNET/ICC Standard 301 1 along with all the modifications to that rule set required in Normative Appendix B, “Modeling Rule Set,” such that the following apply:
- A2. Simulation Requirements [Go to Page]
- A2.1 Performance Calculations. The proposed building performance and baseline building performance shall be calculated using the same simulation program and the same weather data.
- A2.2 Climatic Data. The simulation program shall perform the simulation using hourly values of climatic data, such as temperature and humidity from representative climatic data, for the city in which the proposed design is to be located. For cities o...
- A2.3 The calculation procedure shall not allow the user to directly modify the building component characteristics of the Energy Rating Index reference design or the index adjustment design.
- Normative Appendix B: Modeling Rule Set [Go to Page]
- B1. Requirements for Performance Modeling [Go to Page]
- B1.1 General. This section provides normative requirements for the simulation program and process used to generate the Energy Rating Index (ERI) score. Once software providers have complied with these requirements, and the simulation program is accep...
- B1.2 Energy Modeling Rule Set for Determining the Energy Rating Index of the Proposed Design. The rule set used to determine the ERI shall be in accordance with ANSI/RESNET/ICC Standard 301 1, except where noted in Table B-1.
- Normative Appendix C: Air Leakage Testing [Go to Page]
- C1. Air Leakage Testing [Go to Page]
- C1.1 Testing shall be performed by a fan pressurization technique in accordance with ASTM E779 30, ASTM E1827 31, ASTM E3158 32, or ANSI/RESNET/ICC 380 8, Section 4.
- C1.2 Testing shall be permitted to be conducted at any point after the building has been enclosed.
- C1.3 Single-Dwelling-Unit Buildings. Buildings comprising a single dwelling unit shall be tested with a single fan pressurization test and represent the leakage rate for the entire structure. Where the tested leakage rate exceeds 115% of the design t...
- C1.4 Attached-Dwelling-Unit Buildings. Buildings comprising two or more attached dwelling units or common areas shall be permitted to be tested either as a whole building or as dwelling units in accordance with Section C1.4.1.
- C1.5 Test Protocol
- Normative Appendix D: Installation Requirements [Go to Page]
- D1. Installation of Insulation Materials—General Requirements [Go to Page]
- D1.1 Insulation materials shall be installed in accordance with the requirements of this appendix, the insulation manufacturer’s installation instructions, or applicable industry standards for insulation installation.
- D1.2 Installed insulation materials, amounts, and locations shall comply with the proposed design. In no case shall installed insulation amounts be less than those required to deliver the maximum U-factors defined in Table 6-3 or Table 7-1, as applic...
- D1.3 Installed insulation materials shall fully cover all areas requiring insulation in accordance with the proposed design.
- D1.4 Insulation installations shall be essentially absent of gaps, voids, compression, buckling, and damage that are readily observed by normal inspection practices. Inspections for and corrections of noncompliant installations shall occur prior to e...
- D1.5 Insulation materials that are intended to also serve as an air barrier shall comply with the air barrier requirements of ANSI/ASHRAE/IES Standard 90.1 10, Section 5.4.3.1, at the installed thickness and shall be installed in accordance with the ...
- D2. Installation of Materials Other than Insulation that Provide Thermal Resistance [Go to Page]
- D2.1 Air Spaces
- D2.2 Wood Framing
- Informative Appendix E: Procedures for Generating Prescriptive Paths [Go to Page]
- E1. Prescriptive Compliance Guides [Go to Page]
- E1.1 Worst-Case Home Plan Guides. For a specific home plan to be constructed in a specific weather location, a set of prescriptive specifications may be developed such that under the worst-case home orientation, the specified home plan will comply wi...
- E1.2 Local Area Prescriptive Guides. For a specific weather location, a prototype home configured in accordance with Section E1.2.1 shall be used to generate local-area prescriptive guides for the specified weather location.
- E1.3 Climate Zone Prescriptive Guides. For a specific climate zone, a prototype home configured in accordance with Section E1.3.1 shall be used to generate climate zone prescriptive guides for the specified climate zone.
- E2. Compliance Guide Documents [Go to Page]
- E2.1 Conditioned Space Enclosures
- E2.2 Equipment
- E2.3 Lighting and Appliances
- E2.4 Applicability
- E2.5 Compliance. The compliance guide shall provide summary documentation of the ERI and CRI results of the simulation analysis showing that the compliance guide conforms to the requirements of Section E1.1, E1.2, or E1.3 of this procedure.
- Informative Appendix F: Ducts in Conditioned Space [Go to Page]
- F1. Ducts In Conditioned Space [Go to Page]
- F1.1 The duct system is located completely within the continuous air barrier and within the building thermal envelope.
- F1.2 The ducts are buried within ceiling insulation when all of the following conditions exist:
- F2. Detailed Duct Design
- Informative Appendix G: Step-By-Step Approach for Calculating Lighting Energy Using the Performance Path [Go to Page]
- G1. Prefatory notes
- G2. Procedure
- Informative Appendix H: Plan Review Inspection Checklist
- Informative Appendix I: Site Inspection Checklist
- Informative Appendix J: Framing Factors
- Informative Appendix K: Net Zero Appendix
- Informative Appendix L: Informative References
- Informative Appendix M: Addenda Description [Go to Page]
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