Planning and Design
Climate zones in USA & Canada for building homes
...climate zone corresponds to IECC climate zone 4B (dry).
Cold climate zone
Defined as: any region with between 5,400 and 9,000 heating degree days (on the 65°F basis).
The Building America cold climate corresponds to the IECC climate zones 5 and 6.
Very-cold climate zone
Defined as: any region with between 9,000 and 12,...