I noticed my energy bill was slowly creeping up higher and higher. The first thing I thought could be the cause of the problem, was my air conditioning and heating system. After a thorough inspection, the repair company said that was in great condition. So I did some research online and found that old windows could be the cause of energy bills increasing. I had no idea that as your windows age and lose efficiency, your energy bill begins to go up. In fact, that is one of the earliest signs that your windows may need to be replaced in the near future. If I didn't know this information, I am sure others didn't as well, so I created this site to educate others. This site includes many signs that indicate your windows need to be replaced, including an increasing energy bill.