Double-Hung Windows
The double-hung window is perhaps the most familiar window type. It consists of an upper and lower sash that slide vertically in separate grooves in its side jambs. The maximum vent area of the double-hung, when equipped with sashes equal in height, is 50%. Cottage and Oriel (reverse cottage) versions have unequal sash heights. The traditional Cottage double-hung features a shorter upper sash and taller bottom sash; the Oriel flips that, and exudes a more contemporary feel. Each sash is provided with springs, balances, or compression weatherstripping to hold it in place in any position of travel. Frame styles include full-frame and insert, the latter particularly well suited to replacing old rope and pulley double-hungs. Tilting sashes (for washing), signature grille stylings, and an exterior-mounted insect screen distinguish the double-hung. It is sometimes sold as a single-hung, with the top sash fixed.
