ASHRAE-90.1-2022- - Page 464

Extracted Content

Table Annex1-4 ASHRAE Standard 169-2013, Table A-3: Thermal Climate Zone Definitions

Thermal Zone	Name	I-P Units	SI Units
0	Extremely hot	10,800 < CDD50°F	6000 < CDD10°C
1	Very hot	9000 < CDD50°F 10,800	5000 < CDD10°C 6000
2	Hot	6300 < CDD50°F 9000	3500 < CDD10°C 5000
3	Warm	CDD50°F 6300 and HDD65°F 3600	CDD10°C < 3500 and HDD18°C 2000
4	Mixed	CDD50°F 6300 and 3600 < HDD65°F 5400	CDD10°C < 3500 and 2000 < HDD18°C 3000
5	Cool	CDD50°F 6300 and 5400 < HDD65°F 7200	CDD10°C 3500 and 3000 < HDD18°C 4000
6	Cold	7200 < HDD65°F 9000	4000 < HDD18°C 5000
7	Very cold	9000 < HDD65°F 12600	5000 < HDD18°C 7000
8	Subarctic/arctic	12600 < HDD65°F	7000 < HDD18°C

Figure Annex1-2 ASHRAE Standard 169-2013, Figure A-1: Thermal climate zones as a function of heating and cooling degree-days.

462 ANSI/ASHRAE/IES Standard 90.1-2022 (I-P)