Windows in New Jersey rot and rattle for local reasons. On the shore, salt and wind work on frames, sills, and any metal that was supposed to last. Inland, the freeze opens joints, ice sits on sills, and old wood double-hung units leak air all winter. Dense older blocks add painted-shut sashes, brickmold, and a window unit hanging in the only opening that catches a breeze. The draft you feel is a fact about that opening. Describe it.
Repair and replacement are not the same sentence. Fogged glass, a broken balance, or a sash cord can be a repair. A soft frame, a sill you can push a key into, or a unit that has pulled away from the wall is a replacement. Insert work leaves the old frame. Full-frame work shows the rough opening, which on a shore house may be wet from years of driven rain and in a brick block may be masonry and an old wood buck. Say how many openings and which side takes the weather.
Condensation is common in a state that is humid in summer and closed up in winter. Sweat on the room side of the glass is not the same as a fogged insulated unit. A leak that appears only when the wind is off the water is a flashing or a sill problem, not a speech about the glass. Bedroom windows that must still open, and basement hoppers near grade, should be named separately. Odd sizes show up in older houses. Do not assume a stock unit matches the hole.
Have the material: wood, an older metal unit, or a later replacement. Say whether storms are still mounted. Say if a window unit is how the room cools, because the new sash has to live with that. Ask how the sill is flashed and who patches trim inside and out. On a tight lot, say whether there is side access or only the street. One worst opening, described plainly, is enough to start.
Salt spray, a hard freeze, and a painted city sash are not one window. Windows in New Jersey start with the one that failed and the air that hits it. Call the number on this page.