IECC 2021 · Model

Chapter 4: Commercial And Residential Energy Efficiency

152 sections in this chapter of the IECC 2021 model text — not Model's amended edition.

1. 401.1Scope
2. 403.12Construction of HVAC system elements
3. 403.13Mechanical systems located outside of the building thermal envelope
4. 404.3Heat traps for hot water storage tanks
5. 405.6Dwelling electrical meter
6. 408.3Functional testing of lighting controls
7. C401.1Scope
8. C401.2Application
9. C402.1General
10. C402.1.1Low-energy buildings and greenhouses
11. C402.1.3Insulation component R -value-based method
12. C402.1.5Component performance alternative
13. C402.2Specific building thermal envelope insulation requirements
14. C402.2.2Above-grade walls
15. C402.2.6Insulation of radiant heating systems
16. C402.2.7Airspaces
17. C402.3.1Aged roof solar reflectance
18. C402.4Fenestration
19. C402.4.1Maximum area
20. C402.4.2Minimum skylight fenestration area
21. C402.5Air leakage—thermal envelope
22. C402.5.1.1Air barrier construction
23. C402.5.1.2Air barrier compliance
24. C402.5.3Building thermal envelope testing
25. C402.5.4Air leakage of fenestration
26. C402.5.5Rooms containing fuel-burning appliances
27. C402.5.6Doors and access openings to shafts, chutes, stairways and elevator lobbies
28. C402.5.7Air intakes, exhaust openings, stairways and shafts
29. C403.1General
30. C403.10.1Fan speed control
31. C403.11.1Commercial refrigerators, refrigerator-freezers and refrigeration
32. C403.12Construction of HVAC system elements
33. C403.12.1Duct and plenum insulation and sealing
34. C403.13.1Heating outside a building
35. C403.2System design
36. C403.2.2Ventilation
37. C403.2.3Fault detection and diagnostics
38. C403.3Heating and cooling equipment efficiencies
39. C403.3.1Equipment sizing
40. C403.3.4Boiler turndown
41. C403.4Heating and cooling system controls
42. C403.4.2Off-hour controls
43. C403.4.3Hydronic systems controls
44. C403.4.4Part-load controls
45. C403.4.5Pump isolation
46. C403.5.2Economizer heating system impact
47. C403.5.3Air economizers
48. C403.6.2Single-duct VAV systems, terminal devices
49. C403.6.3Dual-duct and mixing VAV systems, terminal devices
50. C403.6.4Single-fan dual-duct and mixing VAV systems, economizers
51. C403.6.5Supply-air temperature reset controls
52. C403.7Ventilation and exhaust systems
53. C403.7.3Ventilation air heating control
54. C403.7.4Energy recovery systems
55. C403.7.4.1Nontransient dwelling units
56. C403.8.3Fan efficiency
57. C404.1General
58. C404.2Service water-heating equipment performance efficiency
59. C404.2.1High input service water-heating systems
60. C404.3Heat traps for hot water storage tanks
61. + 92 more sections