Replacement windows are specifically named and are different from newly-constructed windows because they are don’t actually take the old window away, you just reinforce them with another material, either for an aesthetic finish, for added strength or endurance, or both (unlike newly-constructed windows, where you literally rip-off the old window and totally replace it). There are many kinds of materials used for replacement windows, but depending on the require finish, you may have to stick on usually one kind of material for you home.
Aside from wood, vinyl has been one of the more popular materials for replacement window use as of late, because of its structural stability and general smooth texture. It is also this apparent compatibility to replacement window use that makes it perfect when you want to create a nice clean finish to a window that is incomparable to other kinds of materials used for windows, such as aluminum.
Vinyl used as material for replacement windows has been known as one of the most efficient in terms of noise and energy reductions, again compared to most other materials used on windows. The plastic-like structure of vinyl also keeps the room warm during winter and cool during summer, when combined with an air conditioning unit.