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Full Description

Standard 90.1 has been a benchmark for commercial building energy codes in the United States and a key basis for codes and standards around the world for more than 35 years. This standard provides the minimum requirements for energy-efficient design of most buildings, except low-rise residential buildings. It offers, in detail, the minimum energy efficiency requirements for design and construction of new buildings and their systems, new portions of buildings and their systems, and new systems and equipment in existing buildings, as well as criteria for determining compliance with these requirements. It is an indispensable reference for engineers and other professionals involved in design of buildings and building systems.

The 2019 edition includes various modifications and clarifications to improve internal consistency and to standardize the structure and language of the document.
Significant changes to requirements include the following

Administration and Enforcement
• New commissioning requirements in accordance with ASHRAE/IES Standard 202
Building Envelope
• Combined categories of “nonmetal framed” and “metal framed” products for vertical fenestration
• Upgraded minimum criteria for SHGC and U-factor across all climate zones
• Revised air leakage section to clarify compliance
• Refined exceptions related to vestibules, added new option and associated criteria for using air curtains
Lighting
• Modified lighting power allowances for Space-by-Space Method and the Building Area Method
• New simplified method for lighting for contractors and designers of renovated office buildings and retail buildings up to 25,000 ft2 (2300 m2).
• Updated lighting control requirements for parking garages to account for the use of LEDs
• Updated daylight responsive requirements, added definition for “continuous dimming” based on NEMA LSD-64-2014
• Clarified side-lighting requirements and associated exceptions
Mechanical
• New requirements to allow the option of using ASHRAE Standard 90.4 instead of ASHRAE Standard 90.1 in computer rooms that have an IT equipment load larger than 10 kW
• Added pump definitions, requirements, and efficiency tables to the standard for the first time
• New equipment efficiency requirement tables and changes to existing tables
• Replaced fan efficiency grade (FEG) efficiency metric with fan energy index (FEI)
• New requirements for reporting fan power for ceiling fans and updated requirements for fan motor selections to increase design options for load-matching variable-speed fan applications
• New energy recovery requirements for high-rise residential building
• New requirement for condenser heat recovery for acute care inpatient hospitals
Energy Cost Budget (ECB) Method (Section 11)
• Numerous changes to ensure continuity
• Set baseline for on-site electricity generation systems
Performance Rating Method (Appendix G)
• Clarified Appendix G rules and corresponding baseline efficiency requirement when combining multiple thermal zones into a single thermal block
• New explicit heating and cooling COPs without fan for baseline packaged cooling equipment
• New rules for modeling impact of automatic receptacle controls
• Set more specific baseline rules for infiltration modeling
• Clarified how plant and coil sizing should be performed
• Updated building performance factors
Both Compliance Paths
• Clearer, more specific rules for treatment of renewables
• New updates to rules for lighting modeling

 

Document History

  1. ASHRAE 90.1-2019 (I-P)

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    viewing


    Standard 90.1-2019 (I-P Edition) -- Energy Standard for Buildings Except Low-Rise Residential Buildings (ANSI Approved; IES Co-sponsored)

    • Most Recent
  2. ASHRAE 90.1-2016 (I-P)


    Standard 90.1-2016 (I-P Edition) -- Energy Standard for Buildings Except Low-Rise Residential Buildings (ANSI Approved; IES Co-sponsored)

    • Historical Version
  3. ASHRAE 90.1-2013 (I-P)


    Standard 90.1-2013 (I-P Edition) -- Energy Standard for Buildings Except Low-Rise Residential Buildings (ANSI Approved; IES Co-sponsored)

    • Historical Version
  4. ASHRAE 90.1-2010 (I-P)


    Standard 90.1-2010 (I-P Edition) -- Energy Standard for Buildings Except Low-Rise Residential Buildings (ANSI Approved; IES Co-sponsored)

    • Historical Version
  5. ASHRAE 90.1-2007 (I-P)


    Standard 90.1-2007 (I-P Edition) -- Energy Standard for Buildings Except Low-Rise Residential Buildings (ANSI Approved; IESNA Co-sponsored)

    • Historical Version
  6. ASHRAE 90.1-2004 (I-P)


    Standard 90.1-2004 (I-P) -- Energy Standard for Buildings Except Low-Rise Residential Buildings (ANSI Approved; IES Co-sponsored)

    • Historical Version
  7. ASHRAE 90.1-2001 (I-P)


    Standard 90.1-2001 (I-P Edition) -- Energy Standard for Buildings Except Low-Rise Residential Buildings (IESNA cosponsored; ANSI approved; Continuous Maintenance Standard)

    • Historical Version
  8. ASHRAE 90.1-1999 (I-P)


    Standard 90.1-1999 (I-P) -- Energy Standard for Buildings Except Low-Rise Residential Buildings (IESNA cosponsored; ANSI approved)

    • Historical Version
  9. ASHRAE 90.1-1989 (Windows version)


    Standard 90.1-1989 (Windows version) -- Energy Efficient Design of New Buildings Except Low-Rise Residential Buildings

    • Historical Version
  10. ASHRAE 90-1975


    Standard 90-1975 -- Energy Conservation in New Building Design

    • Historical Version
 

Amendments, rulings, supplements, and errata

  1. ASHRAE IC 90.1-2019 Addenda t

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    Addenda t to Standard 90.1-2019 -- Energy Standard for Buildings Except Low-Rise Residential Buildings (ANSI Approved; IES Co-sponsored)

  2. ASHRAE IC 90.1-2019 Addenda cq

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    Addenda cq to Standard 90.1-2019 -- Energy Standard for Buildings Except Low-Rise Residential Buildings (ANSI Approved; IES Co-sponsored)

  3. ASHRAE IC 90.1-2019 Addenda co

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    Addenda co to Standard 90.1-2019 -- Energy Standard for Buildings Except Low-Rise Residential Buildings (ANSI Approved; IES Co-sponsored)

  4. ASHRAE IC 90.1-2019 Addenda cm

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    Addenda cm to Standard 90.1-2019 -- Energy Standard for Buildings Except Low-Rise Residential Buildings (ANSI Approved; IES Co-sponsored)

  5. ASHRAE IC 90.1-2019 Addenda bx

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    Addenda bx to Standard 90.1-2019 -- Energy Standard for Buildings Except Low-Rise Residential Buildings (ANSI Approved; IES Co-sponsored)

  6. ASHRAE IC 90.1-2019 Addenda bs

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    Addenda bs to Standard 90.1-2019 -- Energy Standard for Buildings Except Low-Rise Residential Buildings (ANSI Approved; IES Co-sponsored)

  7. ASHRAE IC 90.1-2019 Addenda br

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    Addenda br to Standard 90.1-2019 -- Energy Standard for Buildings Except Low-Rise Residential Buildings (ANSI Approved; IES Co-sponsored)

  8. ASHRAE IC 90.1-2019 Addenda bq

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    Addenda bq to Standard 90.1-2019 -- Energy Standard for Buildings Except Low-Rise Residential Buildings (ANSI Approved; IES Co-sponsored)

  9. ASHRAE IC 90.1-2019 Addenda bj

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    Addenda bj to Standard 90.1-2019 -- Energy Standard for Buildings Except Low-Rise Residential Buildings (ANSI Approved; IES Co-sponsored)

  10. ASHRAE IC 90.1-2019 Addenda bi

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    Addenda bi to Standard 90.1-2019 -- Energy Standard for Buildings Except Low-Rise Residential Buildings (ANSI Approved; IES Co-sponsored)

  11. ASHRAE IC 90.1-2019 Addenda bg

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    Addenda bg to Standard 90.1-2019 -- Energy Standard for Buildings Except Low-Rise Residential Buildings (ANSI Approved; IES Co-sponsored)

  12. ASHRAE IC 90.1-2019 Addenda be

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    Addenda be to Standard 90.1-2019 -- Energy Standard for Buildings Except Low-Rise Residential Buildings (ANSI Approved; IES Co-sponsored)

  13. ASHRAE IC 90.1-2019 Addenda bb

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    Addenda bb to Standard 90.1-2019 -- Energy Standard for Buildings Except Low-Rise Residential Buildings (ANSI Approved; IES Co-sponsored)

  14. ASHRAE IC 90.1-2019 Addenda av

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    Addenda av to Standard 90.1-2019 -- Energy Standard for Buildings Except Low-Rise Residential Buildings (ANSI Approved; IES Co-sponsored)

  15. ASHRAE IC 90.1-2019 Addenda aq

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    Addenda aq to Standard 90.1-2019 -- Energy Standard for Buildings Except Low-Rise Residential Buildings (ANSI Approved; IES Co-sponsored)

  16. ASHRAE IC 90.1-2019 Addenda am

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    Addenda am to Standard 90.1-2019 -- Energy Standard for Buildings Except Low-Rise Residential Buildings (ANSI Approved; IES Co-sponsored)

  17. ASHRAE IC 90.1-2019 Addenda ac

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    Addenda ac to Standard 90.1-2019 -- Energy Standard for Buildings Except Low-Rise Residential Buildings (ANSI Approved; IES Co-sponsored)

  18. ASHRAE IC 90.1-2019 Addenda cu

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    Addenda cu to Standard 90.1-2019 -- Energy Standard for Buildings Except Low-Rise Residential Buildings (ANSI Approved; IES Co-sponsored)

  19. ASHRAE IC 90.1-2019 Addenda ct

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    Addenda ct to Standard 90.1-2019 -- Energy Standard for Buildings Except Low-Rise Residential Buildings (ANSI Approved; IES Co-sponsored)

  20. ASHRAE IC 90.1-2019 Addenda cs

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    Addenda cs to Standard 90.1-2019 -- Energy Standard for Buildings Except Low-Rise Residential Buildings (ANSI Approved; IES Co-sponsored)

  21. ASHRAE IC 90.1-2019 Addenda bv

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    Addenda bv to Standard 90.1-2019 -- Energy Standard for Buildings Except Low-Rise Residential Buildings (ANSI Approved; IES Co-sponsored)

  22. ASHRAE IC 90.1-2019 Addenda bt

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    Addenda bt to Standard 90.1-2019 -- Energy Standard for Buildings Except Low-Rise Residential Buildings (ANSI Approved; IES Co-sponsored)

  23. ASHRAE IC 90.1-2019 Addenda bf

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    Addenda bf to Standard 90.1-2019 -- Energy Standard for Buildings Except Low-Rise Residential Buildings (ANSI Approved; IES Co-sponsored)

  24. ASHRAE IC 90.1-2019 Addenda bd

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    Addenda bd to Standard 90.1-2019 -- Energy Standard for Buildings Except Low-Rise Residential Buildings (ANSI Approved; IES Co-sponsored)

  25. ASHRAE IC 90.1-2019 Addenda cj

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    Addenda cj to Standard 90.1-2019 -- Energy Standard for Buildings Except Low-Rise Residential Buildings (ANSI Approved; IES Co-sponsored)

  26. ASHRAE IC 90.1-2019 Addenda ci

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    Addenda ci to Standard 90.1-2019 -- Energy Standard for Buildings Except Low-Rise Residential Buildings (ANSI Approved; IES Co-sponsored)

  27. ASHRAE IC 90.1-2019 Addenda cg

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    Addenda cg to Standard 90.1-2019 -- Energy Standard for Buildings Except Low-Rise Residential Buildings (ANSI Approved; IES Co-sponsored)

  28. ASHRAE IC 90.1-2019 Addenda cf

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    Addenda cf to Standard 90.1-2019 -- Energy Standard for Buildings Except Low-Rise Residential Buildings (ANSI Approved; IES Co-sponsored)

  29. ASHRAE IC 90.1-2019 Addenda ce

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    Addenda ce to Standard 90.1-2019 -- Energy Standard for Buildings Except Low-Rise Residential Buildings (ANSI Approved; IES Co-sponsored)

  30. ASHRAE IC 90.1-2019 Addenda bz

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    Addenda bz to Standard 90.1-2019 -- Energy Standard for Buildings Except Low-Rise Residential Buildings (ANSI Approved; IES Co-sponsored)

  31. ASHRAE IC 90.1-2019 Addenda bw

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    Addenda bw to Standard 90.1-2019 -- Energy Standard for Buildings Except Low-Rise Residential Buildings (ANSI Approved; IES Co-sponsored)

  32. ASHRAE IC 90.1-2019 Addenda z

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    Addenda z to Standard 90.1-2019 -- Energy Standard for Buildings Except Low-Rise Residential Buildings (ANSI Approved; IES Co-sponsored)

  33. ASHRAE IC 90.1-2019 Addenda cb

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    Addenda cb to Standard 90.1-2019 -- Energy Standard for Buildings Except Low-Rise Residential Buildings (ANSI Approved; IES Co-sponsored)

  34. ASHRAE IC 90.1-2019 Addenda at

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    Addenda at to Standard 90.1-2019 -- Energy Standard for Buildings Except Low-Rise Residential Buildings (ANSI Approved; IES Co-sponsored)

  35. ASHRAE IC 90.1-2019 Addenda as

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    Addenda as to Standard 90.1-2019 -- Energy Standard for Buildings Except Low-Rise Residential Buildings (ANSI Approved; IES Co-sponsored)

  36. ASHRAE IC 90.1-2019 Addenda y

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    Addenda y to Standard 90.1-2019 -- Energy Standard for Buildings Except Low-Rise Residential Buildings (ANSI Approved; IES Co-sponsored)

  37. ASHRAE IC 90.1-2019 Addenda x

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    Addenda x to Standard 90.1-2019 -- Energy Standard for Buildings Except Low-Rise Residential Buildings (ANSI Approved; IES Co-sponsored)

  38. ASHRAE IC 90.1-2019 Addenda ah

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    Addenda ah to Standard 90.1-2019 -- Energy Standard for Buildings Except Low-Rise Residential Buildings (ANSI Approved; IES Co-sponsored)

  39. ASHRAE IC 90.1-2019 Addenda ae

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    Addenda ae to Standard 90.1-2019 -- Energy Standard for Buildings Except Low-Rise Residential Buildings (ANSI Approved; IES Co-sponsored)

  40. ASHRAE IC 90.1-2019 Addenda ad

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    Addenda ad to Standard 90.1-2019 -- Energy Standard for Buildings Except Low-Rise Residential Buildings (ANSI Approved; IES Co-sponsored)

  41. ASHRAE IC 90.1-2019-5

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    IC 90.1-2019-5 to Standard 90.1-2019 -- Energy Standard for Buildings Except Low-Rise Residential Buildings (ANSI Approved; IES Co-sponsored)

  42. ASHRAE IC 90.1-2019 Addenda b

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    Addenda b to Standard 90.1-2019 -- Energy Standard for Buildings Except Low-Rise Residential Buildings (ANSI Approved; IES Co-sponsored)

  43. ASHRAE IC 90.1-2019-8

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    IC 90.1-2019-8 to Standard 90.1-2019 -- Energy Standard for Buildings Except Low-Rise Residential Buildings (ANSI Approved; IES Co-sponsored)

  44. ASHRAE IC 90.1-2019-7

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    IC 90.1-2019-7 to Standard 90.1-2019 -- Energy Standard for Buildings Except Low-Rise Residential Buildings (ANSI Approved; IES Co-sponsored)

  45. ASHRAE IC 90.1-2019 Addenda ao

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    Addenda ao to Standard 90.1-2019 -- Energy Standard for Buildings Except Low-Rise Residential Buildings (ANSI Approved; IES Co-sponsored)

  46. ASHRAE IC 90.1-2019 Addenda an

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    Addenda an to Standard 90.1-2019 -- Energy Standard for Buildings Except Low-Rise Residential Buildings (ANSI Approved; IES Co-sponsored)

  47. ASHRAE IC 90.1-2019 Addenda ak

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    Addenda ak to Standard 90.1-2019 -- Energy Standard for Buildings Except Low-Rise Residential Buildings (ANSI Approved; IES Co-sponsored)

  48. ASHRAE IC 90.1-2019 Addenda aj

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    Addenda aj to Standard 90.1-2019 -- Energy Standard for Buildings Except Low-Rise Residential Buildings (ANSI Approved; IES Co-sponsored)

  49. ASHRAE IC 90.1-2019 Addenda v

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    Addenda v to Standard 90.1-2019 -- Energy Standard for Buildings Except Low-Rise Residential Buildings (ANSI Approved; IES Co-sponsored)

  50. ASHRAE IC 90.1-2019 Addenda u

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    Addenda u to Standard 90.1-2019 -- Energy Standard for Buildings Except Low-Rise Residential Buildings (ANSI Approved; IES Co-sponsored)

  51. ASHRAE IC 90.1-2019 Addenda o

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    Addenda o to Standard 90.1-2019 -- Energy Standard for Buildings Except Low-Rise Residential Buildings (ANSI Approved; IES Co-sponsored)

  52. ASHRAE 90.1-2019 (I-P) Errata (July 26, 2021)

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    Errata to Standard 90.1-2019 (I-P Edition) -- Energy Standard for Buildings Except Low-Rise Residential Buildings (ANSI Approved; IES Co-sponsored)

  53. ASHRAE IC 90.1-2019 Addenda ab

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    Addenda ab to Standard 90.1-2019 -- Energy Standard for Buildings Except Low-Rise Residential Buildings (ANSI Approved; IES Co-sponsored)

  54. ASHRAE IC 90.1-2019-6

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    IC 90.1-2019-6 to Standard 90.1-2019 -- Energy Standard for Buildings Except Low-Rise Residential Buildings (ANSI Approved; IES Co-sponsored)

  55. ASHRAE 90.1-2019 (I-P) Errata (May 20, 2021)

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    Errata to Standard 90.1-2019 (I-P Edition) -- Energy Standard for Buildings Except Low-Rise Residential Buildings (ANSI Approved; IES Co-sponsored)

  56. ASHRAE 90.1-2019 (I-P) Errata (April 8, 2021)

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    Errata to Standard 90.1-2019 (I-P Edition) -- Energy Standard for Buildings Except Low-Rise Residential Buildings (ANSI Approved; IES Co-sponsored)

  57. ASHRAE 90.1-2019 Addenda aa

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    Addenda aa to Standard 90.1-2019 -- Energy Standard for Buildings Except Low-Rise Residential Buildings (ANSI Approved; IES Co-sponsored)

  58. ASHRAE 90.1-2019 (I-P) Errata (December 21, 2020)

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    Errata to Standard 90.1-2019 (I-P Edition) -- Energy Standard for Buildings Except Low-Rise Residential Buildings (ANSI Approved; IES Co-sponsored)

  59. ASHRAE 90.1-2019 Addenda g

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    Addenda g to Standard 90.1-2019 -- Energy Standard for Buildings Except Low-Rise Residential Buildings (ANSI Approved; IES Co-sponsored)

  60. ASHRAE 90.1-2019 Addenda da

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    Addenda da to Standard 90.1-2019 -- Energy Standard for Buildings Except Low-Rise Residential Buildings (ANSI Approved; IES Co-sponsored)

  61. ASHRAE 90.1-2019 Addenda d

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    Addenda d to Standard 90.1-2019 -- Energy Standard for Buildings Except Low-Rise Residential Buildings (ANSI Approved; IES Co-sponsored)

  62. ASHRAE 90.1-2019 Addenda cr

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    Addenda cr to Standard 90.1-2019 -- Energy Standard for Buildings Except Low-Rise Residential Buildings (ANSI Approved; IES Co-sponsored)

  63. ASHRAE 90.1-2019 (I-P) Errata (November 13, 2020)

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    Errata to Standard 90.1-2019 (I-P Edition) -- Energy Standard for Buildings Except Low-Rise Residential Buildings (ANSI Approved; IES Co-sponsored)

  64. ASHRAE 90.1-2019 (I-P) Errata (October 5, 2020)

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    Errata to Standard 90.1-2019 (I-P Edition) -- Energy Standard for Buildings Except Low-Rise Residential Buildings (ANSI Approved; IES Co-sponsored)

  65. ASHRAE 90.1-2019 (I-P) Errata (July 23, 2020)

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    Errata to Standard 90.1-2019 (I-P Edition) -- Energy Standard for Buildings Except Low-Rise Residential Buildings (ANSI Approved; IES Co-sponsored)

  66. ASHRAE 90.1-2019 Addenda af, bc, db

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    Addenda af, bc, and db to Standard 90.1-2019 -- Energy Standard for Buildings Except Low-Rise Residential Buildings (ANSI Approved; IES Co-sponsored)

  67. ASHRAE IC 90.1-2019-4

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    IC 90.1-2019-4 to Standard 90.1-2019 -- Energy Standard for Buildings Except Low-Rise Residential Buildings (ANSI Approved; IES Co-sponsored)

  68. ASHRAE IC 90.1-2019-3

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    IC 90.1-2019-3 to Standard 90.1-2019 -- Energy Standard for Buildings Except Low-Rise Residential Buildings (ANSI Approved; IES Co-sponsored)

  69. ASHRAE IC 90.1-2019-2

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    IC 90.1-2019-2 to Standard 90.1-2019 -- Energy Standard for Buildings Except Low-Rise Residential Buildings (ANSI Approved; IES Co-sponsored)

  70. ASHRAE IC 90.1-2019-1

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    IC 90.1-2019-1 to Standard 90.1-2019 -- Energy Standard for Buildings Except Low-Rise Residential Buildings (ANSI Approved; IES Co-sponsored)

  71. ASHRAE 90.1-2019 (I-P) Errata (April 8, 2020)

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    Errata to Standard 90.1-2019 (I-P Edition) -- Energy Standard for Buildings Except Low-Rise Residential Buildings (ANSI Approved; IES Co-sponsored)

  72. ASHRAE 90.1-2019 (I-P) Errata (February 21, 2020)

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    Errata to Standard 90.1-2019 (I-P Edition) -- Energy Standard for Buildings Except Low-Rise Residential Buildings (ANSI Approved; IES Co-sponsored)

  73. ASHRAE 90.1-2019 (I-P) Errata (February 14, 2020)

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    Errata to Standard 90.1-2019 (I-P Edition) -- Energy Standard for Buildings Except Low-Rise Residential Buildings (ANSI Approved; IES Co-sponsored)

  74. ASHRAE 90.1-2019 (I-P) Errata (January 14, 2020)

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    Errata to Standard 90.1-2019 (I-P Edition) -- Energy Standard for Buildings Except Low-Rise Residential Buildings (ANSI Approved; IES Co-sponsored)

  75. ASHRAE 90.1-2019 (I-P) Errata (November 8, 2019)

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    Errata to Standard 90.1-2019 (I-P Edition) -- Energy Standard for Buildings Except Low-Rise Residential Buildings (ANSI Approved; IES Co-sponsored)