Passive Solar Retrofit

Publication Type:
Fact Sheet

Published / Updated:

Passive solar retrofit is the adding of solar features to an existing house which can lower heating costs. Common passive retrofits include:

  • Windows & thermal mass storage for direct gain
  • Thermosiphoning air panel (TAP) for direct gain
  • Trombé wall for indirect gain
  • Sunspace or greenhouse for isolated gain

Before you begin a passive solar retrofit, you should make sure that your house is energy-efficient, that it has a good southern exposure, and that the retrofit will be appropriate, in cost and function, for your home.

Download this fact sheet to learn about the following topics:

  • Ensuring or improving energy efficiency as part of the retrofit
  • Determining if a solar retrofit is right for your home
  • Assessing the solar access of your home
  • Evaluating retrofit options

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