Instantly recognizable, the brownstone rowhouses are a symbol of Midtown Manhattan. The “brownstone era” started in the mid-1800, however, while the stone structures are still standing strong, doors and windows are a whole different story. Mostly made of wood, these parts of the house need to be either repaired or replaced from time to time.
The obvious difference between double hung and single hung windows is that a single has one moveable sash that opens by sliding up or down a track while the other sash remains fixed in place, whereas on a double hung window, both sashes are moveable. Although this difference may seem slight, both designs possess their own advantages and disadvantages.