SECURITY: Because they only open in one direction, there are fewer potential points of failure in a single-hung window’s locking mechanism. It’s also easier to lock up at night or for the season with only a single lock to engage on each window.
ENERGY EFFICIENCY: Fixed windows are the most efficient type of window because air infiltration is extremely minimal. Since single-hung windows only feature one movable sash, less air makes its way through the fixed sash, even as the window ages and settles or warps slightly. Less air infiltration means lower heating and cooling bills.
COST: If you’re trying to purchase new windows on a budget, and you don’t need to operate the upper sash, single-hung windows are a great choice. With fewer moving parts than double-hung windows, they’re often more affordable.