Upgrade your windows
Windows also allow a lot of warm air to escape from your furnace. As a result, replacing your outdated windows is a worthwhile investment. Insulated glass windows are the most effective at keeping the heat in, and many windows are constructed with this enhanced material. If not, storm windows might be an excellent idea (especially if your area experiences tumultuous weather such as tropical storms, snowstorms, hurricanes, etc. frequently). Storm windows are installed on the outside of your windows and provide an additional layer of protection. This is advantageous since they can be removed during the summer months if more air is required.
Windows can also be fixed by replacing hardware such as latches, cranks, and locks, or by caulking and weatherstripping. Total window and frame replacement with new, high-performance ENERGY STAR certified windows or inserts is sometimes the best option. Inserts might be a nice alternative if the frames are still in good shape, especially for vintage properties.