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D
- Degree day
- A unit that represents a one-degree Fahrenheit deviation from some fixed reference point (usually 65° F) in the mean, daily outdoor temperature. See also heating degree day.
- Desiccant
- An extremely porous crystalline substance used to absorb moisture from within the sealed air space of an insulating glass unit.
- Dewpoint
- The temperature at which water vapor in air will condense at a given state of humidity and pressure.
- Divided light
- A window with a number of smaller panes of glass separated and held in place by muntins.
- DOE-2.1E
- A building-simulation computer program used to calculate total annual energy use.
- Double glazing
- In general, two thicknesses of glass separated by an air space within an opening to improve insulation against heat transfer and/or sound transmission. In factory-made double glazing units, the air between the glass sheets is thoroughly dried and the space is sealed airtight, eliminating possible condensation and providing superior insulating properties.
- Double-hung window
- A window consisting of two sashes operating in a rectangular frame, in which both the upper and lower halves can be slid up and down. A counterbalance mechanism usually holds the sash in place.
- Double-strength glass
- Sheet glass between 0.115" and 0.133" (33.38 mm) thick.
- Drip
- A projecting fin or a groove at the outer edge of a sill, soffit, or other projecting member in a wall designed to interrupt the flow of water downward over the wall or inward across the soffit.
