Do you know where the weakest link in your home insulation is located? It might not always be easy to figure out, but often you will find that your windows are a major culprit when it comes to lost heat. While double pane windows will be much more effective when it comes to insulation, they could still have issues due to cracks around the window frame. An easy way to find where such leaks are located is using an infrared camera, but if you don’t have access to one of those devices, you could shine a light along the edge of the window and have a friend spotting it for you on the other side. If there is rotting wood around your window, you will need to do a thorough cleaning, making sure not to leave any trace of it behind. If you do, there is a good chance that the rot will resurface, undoing any restoration work that you have done.