What are the two methods of compliance with the California Energy Code?

The two methods of compliance with the California Energy Code are indeed the prescriptive and performance approach options. The prescriptive approach provides specific requirements that must be met, such as minimum insulation levels, efficiency ratings for heating and cooling systems, and other specific construction details laid out in the code. This method is straightforward and often favored for its clarity, making it easy to understand what is required to comply with energy efficiency standards.

On the other hand, the performance approach allows for greater flexibility. Instead of adhering to specific prescriptive measures, projects demonstrate compliance by showing that their energy performance meets or exceeds the minimum efficiency standards through energy modeling. This method can accommodate innovative designs and systems that may not follow traditional prescriptive requirements but still achieve energy efficiency goals.

The cooperation of both methods in the California Energy Code enables designers and builders to either follow a clear set of requirements or explore more customized energy-saving strategies while ensuring overall energy performance aligns with the state's objectives.