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Energy Performance
Title 24 Compliance
Title 24 of the California Code of Regulations encompasses the state's Building Standards Code. Part 6 specifically pertains to the California Energy Code, which outlines energy conservation standards for residential and nonresidential buildings. This code aims to promote energy efficiency, reduce greenhouse gas emissions, and decrease energy consumption in buildings throughout the state.
As energy efficiency leads to lower energy expenses for homeowners and mitigates environmental effects, building regulations play a crucial role in shaping California's future. Prior to issuing a building permit, municipalities in California mandate the submission of a Title 24 energy report (also known as Title 24 energy calculations). This report confirms compliance with Title 24 standards, ensuring that building designs align with the latest energy code.
Compliance Methods
There are two methods of compliance for Title 24: Prescriptive and Performance. Both reports require information pertaining to the energy efficiency and construction of the home.
- The prescriptive method is the most time efficient and straightforward approach at meeting minimum energy requirements for a home or building. This approach is the simplest way to rate performance, but requires each component to meet established minimum efficiency values per climate zone.
- The performance method offers unparalleled flexibility and precision in crafting an effective energy plan for homes or buildings. Utilizing certified component modeling software, the building's systems are analyzed comprehensively to establish an overarching energy allocation. For instance, the energy performance of windows and doors can be balanced against factors like wall insulation and electrical efficiency. Additionally, there's potential for trade-offs, such as combining less efficient windows with more efficient ones to achieve an overall product average.
What is Measured and How it Works
Windows and doors experience heat exchange through several mechanisms:
- Direct conduction and convection heat transfer occur through the glass or multi-layer glazing and framing.
- Thermal radiation occurs into and out of a house from objects at room temperature, such as exterior walls, windows, people, equipment, furniture, and interior walls.
- Solar radiation enters a house and is converted to heat when absorbed by building surfaces.
- Air leakage occurs through and around the window or door.
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U-Factor
Solar Heat Gain Coefficient
Visible Transmittance
Condensation
The California Energy Commission periodically revises the energy standards to accommodate the evaluation and potential integration of emerging energy-efficient technologies and methodologies.
Our AG Millworks Door and Window Systems have consistently met or surpassed each revision of the California energy-efficient standards. Our products are listed under the NFRC website as Certified and Title 24 Prescriptive Compliant.
Homeowners, and ultimately the environment, are the primary beneficiaries of the Title 24 energy efficiency standards. Anticipated to result in a roughly 30% decrease in annual energy consumption for new homes, Californians stand to collectively save at least $100 million annually through reduced electricity expenses. This initiative not only fosters a diminished carbon footprint for Californians but also promotes a more comfortable and financially prudent lifestyle.