Energy Impact

In a typical house, windows account for 20% to 25% of the total heat loss and over 45% of the building's designed cooling load. In other words, windows account for a substantial portion of the energy load on homes. This lesson introduces the basic properties that establish a window's thermal and structural performance.

Learning Objectives

At the conclusion of this lesson, you will be able to:

• Identify the ways windows affect comfort in a home
• Explain the purpose of the NFRC label
• Describe each of the properties listed on the NFRC label
• Review the principles of heat transfer
• Summarize how heat transfers through a window
• Identify the window features that can improve a home's thermal performance

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