Practice

Passive solar design

Also known as: Passive solar, Solar architecture

Building design that harvests sun for heating and uses building geometry, mass, and ventilation for cooling — without mechanical equipment. Principles: south-facing glazing for winter solar gain, thermal mass to absorb and slowly release heat, summer shading to prevent overheating, insulation to retain captured heat, and natural ventilation paths for cooling. Practiced in vernacular architecture for millennia (adobe pueblos, courtyard houses, traditional Japanese homes); formalized in 1970s North America after the energy crises and through the work of architects like Edward Mazria and David Wright.

Five principles

Passive solar design integrates:

Aperture (south-facing glazing) — sized to admit appropriate winter solar gain (rule of thumb: 7-12% of floor area for moderate climates)
Absorber (dark surface) — typically interior masonry floor or wall directly receiving winter sun
Thermal mass (storage) — masonry, concrete, water tanks; absorbs heat during the day, releases at night
Distribution — natural convection, radiation, conduction; or low-energy fans
Control (shading and reflection) — overhangs that block summer sun; insulation; window treatments

Climate adaptation

Passive solar design is climate-specific:

Hot-arid climates — emphasis on thermal mass + night ventilation; courtyards and shaded outdoor spaces; minimal east/west glazing
Cold climates — high south-facing glazing + insulation + thermal mass; minimal north windows
Hot-humid climates — passive cooling more important than passive heating; emphasis on ventilation, shading, light-color surfaces
Temperate climates — full integration; can capture both winter sun and summer breeze

Vernacular precedents

Most pre-industrial vernacular architecture is implicitly passive-solar:

Pueblo Indian adobe — Southwest USA; thick adobe walls; small north-facing openings; south-facing common spaces
Courtyard houses — Mediterranean, Middle East, China; central courtyard provides ventilation and shaded outdoor space
Traditional Japanese houses — sliding screens for cross-ventilation; deep eaves for summer shading; tatami floors as modest thermal mass
Hopi mesa villages — sited specifically for solar exposure
Traditional New England saltbox — south-facing glazing; long sloping north roof against winter wind

Modern formalization

Edward Mazria’s The Passive Solar Energy Book (1979) was the central modern text. The 1970s energy crises accelerated interest; thousands of passive-solar homes were built in the late 1970s and early 1980s. Interest declined with falling oil prices in the 1980s but persisted through specialty builders and is now revived through modern energy-efficiency and net-zero-building movements.

Sources

The Passive Solar Energy Book, Edward Mazria (Rodale, 1979)
Passive Solar Architecture, David Bainbridge and Ken Haggard (Chelsea Green, 2011)
DOE Passive Solar Heating and Cooling technical documentation

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Practical

shares approach with

Deep energy retrofit deep retrofits often add passive-solar elements alongside efficiency upgrades — south-facing aperture, thermal mass
District heating district heating and passive-solar building design together can reduce a city's heating demand to near-zero through efficient supply + efficient demand
Earth-sheltered building earth-sheltered design is often combined with passive-solar — south-facing aperture, north-bermed walls; together they produce extremely low heating loads
Earthship Earthships are extreme passive-solar designs — earth-mass walls, south-facing greenhouse, thermal-mass storage
Ground-source heat pump passive-solar building design + GSHP together can reduce heating energy use to a small fraction of conventional buildings
Solar photovoltaic passive-solar (heat from sun directly) and solar-PV (electricity from sun) are complementary; integrated solar building design uses both
Solar thermal active solar thermal (collectors with pumps) and passive solar building design are both forms of using sun's heat directly
Tiny house tiny houses' small footprint enables passive-solar design that's hard to achieve in larger homes

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