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Passive House is
. . . the design and construction of buildings,
. . . that require limited amounts of,
. . . fuel or electricity, to heat or cool.
The standard, unsurprisingly,
. . . makes extensive use of:
. . . . . . insulation,
. . . . . . super-insulation,
. . . . . . passive solar design,
. . . . . . low-energy construction techniques, etc.

Generally speaking, annual energy needs,
. . . can be reduced by between
. . . 60% to 95%, as compared to conventional design.

Basic design elements include:
. . . . . . passive solar design (primary windows facing towards winter sun, compacts house design, etc.);
. . . . . . some internal thermal mass;
. . . . . . insulation and/or super-insulation;
. . . . . . outside wall color choices made based on specific climate;
. . . . . . possible low-volume heat recovery ventilation systems;
. . . . . . windows with very high R-values (triple-pane, glazed, etc.);
. . . . . . eliminated thermal bridges;
. . . . . . possible passive natural ventilation;
. . . . . . possible mechanical heat recovery ventilation systems; and
. . . . . . insulated ventilation ducts; amongst a great many others.

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3-11-2018 Source:  Passive #House: What is it?