Drafty windows could have many explanations and many causes.
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One cause could be improper installation, it is not always the reason but is has been known to happen. If this turns out to be the case, the windows donít have to be removed or replaced to fix the problem. Re caulk the window and adding extra insulation will help with the problem.
Contact the contractor and or the builder who installed them and explain your problem to them. But the problem may be that the drafty windows are more than just a few years old. In this case, it could be weather worn. The weather stripping may need to be replaced or extra insulation may do the trick.
But if it is weather worn depending how worn they are, you may want to think about replacing the windows in the house. If you decide to do this consider energy efficient windows. You will never see a drafty window again. The energy efficient windows are designed to keep the air warm air in and the cold air out.
Do some research gather as much information as you can and get the windows with the Energy Star logo on it.