Windows are the eyes to home, but they’re also a key source of vulnerability for your property. Windows are one of the main sources where your home is losing its valuable energy. Every winter, heat is lost through your windows like cash into the drain. Worn and deteriorated windows are also potentially a security risk for break-ins. This is why it’s so important that your windows are not just in working order, but that they’re truly top-of-the-line. Here’s a checklist of five signs to watch out for to know if your windows need replacing.