A building's envelope refers to the exterior elements that protect the interior spaces from the outdoor environment, including walls, windows, doors, roofs, and insulation. The envelope is responsible for controlling heat gain and loss, air infiltration, and moisture control.
On the other hand, a building's interior refers to the enclosed spaces within the envelope, including all interior walls, floors, and ceilings. The interior spaces are designed to accommodate various activities and functions, such as living, working, and leisure activities. The interior also includes HVAC systems, lighting, and other mechanical and electrical systems that regulate the indoor environment.
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