Damaged windows can cause various problems, from uncomfortable temperature shifts to expensive structural damage. There are several window problems you can look for to help you determine whether your home needs high-quality replacement windows: Cracked or Broken Glass: Window panes that are cracked or broken need immediate attention before proving to be a serious safety hazard. Although it may be possible to replace the glass, your window could become drafty and energy inefficient because the seal won't be as strong as the seal on a new replacement window; Air Leaks: Improperly sealed windows allow air to flow in from outside, causing drafts, uncomfortable temperature fluctuations, and increased energy bills. Unfortunately, you cannot repair single-paned windows or large air leaks with caulking or weatherstripping. Double-paned replacement windows with high energy-efficiency ratings can save you money on heating and cooling and make your home feel more comfortable; Cloudy or Foggy Glass: When the seal on a double-paned window is broken, rain and moisture can seep in and get trapped between the window panes. The trapped moisture can cause the window frame and the surrounding area to rot. It's essential to have the window replaced before the trapped moisture causes costly damage to your home; Stuck Window Sashes: Dirt buildup in window tracks can cause windows to be hard to open. In this case, a good cleaning could fix the problem. However, if broken window hardware is making the window stick, it could be necessary to replace the windows since window hardware is often difficult to replace; Wooden Window Frame Rot: If you notice that your wood windows are beginning to rot, you might be able to scrape out the rot and patch the frame. Windows with extensive wood rot can't be saved by window repair; instead, the windows need to be replaced before the damage spreads to the surrounding areas.