United States

International Energy Conservation Code (IECC 2012) - Residential

The International Energy Conservation Code (IECC) is a model code that regulates minimum energy conservation requirements for new buildings. The IECC addresses energy conservation requirements for all aspects of energy uses in both commercial and residential construction, including heating and ventilating, lighting, water heating, and power usage for appliances and building systems.  (source: IECC 2012)

Applicable Building Type(s)

New residential

Policy Requirement Level

Model Code

Policy Sequence

Governance

Development Authority: International Code Council

Implementation Authority: Adopting state or local jurisdictions

Prescriptive Compliance path

Energy Requirements:

Performance Compliance path

Energy Requirements:

Resources

Notes

Climate zones

ZONE 
NUMBER
THERMAL CRITERIA
IP Units
SI Units
1
9000 < CDD50°F 5000 < CDD10°C
2
6300 < CDD50°F ≤ 9000 3500 < CDD10°C ≤ 5000
3A and 3B
4500 < CDD50°F ≤ 6300
AND HDD65°F ≤ 5400
2500 < CDD10°C ≤ 3500
AND HDD18°C ≤ 3000
4A and 4B
CDD50°F ≤ 4500 AND
HDD65°F ≤ 5400
CDD10°C ≤ 2500 AND
HDD18°C ≤ 3000
3C
HDD65°F ≤ 3600 HDD18°C ≤ 2000
4C
3600 < HDD65°F ≤ 5400 2000 < HDD18°C ≤ 3000
5
5400 < HDD65°F ≤ 7200 3000 < HDD18°C ≤4000
6
7200 < HDD65°F ≤ 9000 4000 < HDD18°C ≤ 5000
7
9000 < HDD65°F ≤ 12600 5000 < HDD18°C ≤ 7000
8
12600 < HDD65°F 7000 < HDD18 °C