From the heat of summer to the cold of winter and the moisture of rains, windows do a great job in protecting the people and furniture within the house, thereby protecting them from the elements. Like every other piece of furniture, windows do wither away with time and need regular replacement. Inefficiently insulating windows lead directly to high expenditure on heating and cooling systems within the house. Increasing the energy efficiency of the windows goes a long way in cutting down on the expenses in such a scenario. If the windows of your current home are rotten or withered, it’s high time that a quality replacement is done. Window replacement is a task that involves intricate details as to how energy expenses can be cut down. Thus, it is important that you are well-versed with how energy efficiency is measured and what it means, so that you can make wise decisions. There are official rating councils that rate windows and doors according to their efficiency in shielding the house from weather extremes. A term called the U-factor helps them rate the windows to suggest replacement or establish quality. It is advisable to opt for windows with a low U factor, meaning they are of greater efficiency and insulating capacity. By choosing the right replacement windows, you can stay in comfort and optimum temperature and moisture, and even maintain energy efficiency!