Energy · 6 min

How to Check Your Windows Energy Performance

Before spending $10,000 on new windows, check whether your existing windows are the actual source of your energy and comfort problem. Many San Diego homeowners replace windows for an issue that turns out to be air sealing, not glass performance.

What you'll learn

  • How to use the incense smoke test to find air infiltration at window perimeters without any tools
  • What the NFRC label on your existing windows tells you about current performance
  • The difference between heat gain through glass (an SHGC problem) and drafts at the frame (an air-sealing problem)
  • How to calculate whether new windows have a reasonable energy payback period for your San Diego home

Step by step

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Safety note

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