It really depends on the type of windows you have in your house. If you have older, single-glazed windows, they allow a lot of heat transmission, so when its cold outside and you’re trying to keep the house warm, you loose a lot of heat, vice-versa with cooling in the summer. New technologies, such as argon-filled windows have greatly increased the energy-efficiency of windows. Generally, look for double-glazed windows with the EnergyStar rating. The links below should be very helpful if you want to know more.
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