What is the optimal window-to-floor ratio for passive solar?

7-12% of floor area in south-facing glazing is the general guideline for most temperate climates. More in cold sunny climates; less in marine climates with limited sun.

What is the overhang calculation for passive solar?

Overhang depth = window height × tan(90° - summer solstice angle). This allows full winter sun while blocking most summer direct sun.

Passive Solar Design Window-to-Floor Ratio Calculator

Formula Definitions

The Passive Solar Design Window-to-Floor Ratio Calculator works by applying a well-defined formula to the values you enter. Understanding the formula behind the calculation helps you interpret the result and check that your inputs are correct. Below we break down the key components that drive the Passive Solar Design.

The core formula used by this calculator is:

Result = f(inputs, settings)

Each variable in the formula has a specific meaning:

inputs — Values entered into the Passive Solar Design.
settings — Options, units, or parameters that adjust how the calculation is performed.
Result — Computed output for the chosen inputs and settings.

How to Use This Calculator

Enter the required values. Enter the required values into the Passive Solar Design Window-to-Floor Ratio Calculator input fields.
Adjust settings. Adjust any settings, select applicable options, or choose units as needed.
Calculate the result. Press Calculate to compute the result using the underlying formula.
Interpret the output. Review and interpret your result using the provided context, reference ranges, or explanatory notes.

Glossary and Definitions

Input: A value entered into the calculator to be processed.
Output: The computed result returned by the calculator for the given inputs.
Setting: An option that adjusts how the calculation is performed, such as unit selection or mode.
Passive solar design: A key concept referenced by the Passive Solar Design: Calculate the optimal south-facing window-to-floor area ratio for passive solar heating. Size thermal mass, overhang depth, and glazing area to maximize winter solar gain while minimizing summer overheating in your climate zone.
Window to floor ratio: A key concept referenced by the Passive Solar Design: Calculate the optimal south-facing window-to-floor area ratio for passive solar heating. Size thermal mass, overhang depth, and glazing area to maximize winter solar gain while minimizing summer overheating in your climate zone.
Solar gain calculation: A key concept referenced by the Passive Solar Design: Calculate the optimal south-facing window-to-floor area ratio for passive solar heating. Size thermal mass, overhang depth, and glazing area to maximize winter solar gain while minimizing summer overheating in your climate zone.
Passive house windows: A key concept referenced by the Passive Solar Design: Calculate the optimal south-facing window-to-floor area ratio for passive solar heating. Size thermal mass, overhang depth, and glazing area to maximize winter solar gain while minimizing summer overheating in your climate zone.

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