First of all, attention should be paid to the choice of a double -glazed window. It will depend on him how much quieter will become at your place. It is better not to choose single -chamber double -glazed windows, although they win in price, they will not provide good sound insulation in the apartment. True, if the budget is limited, single -chamber double -glazed windows can be put, only you need to look so that the glass is low -emission (with silver atoms). It allows you to pass the rays of the sun and hold the heat in the house. True, PVC windows do not advise putting in apartments going to noisy streets. Two -chamber double -glazed windows are best suited here. The internal space (between the glasses) is filled with inert gas, most often an argon or crypton. Thanks to this, soundproofing and thermal insulation in the apartment will be at a high level.