Windows and doors can account for up to 25 percent of total house heat loss. There are a number of options for upgrading the energy efficiency of your windows. Windows can be repaired by servicing hardware such as latches, cranks and locks or retrofitted with caulking and weather stripping or adding glazing and storm windows. At times the best choice is total window and frame replacement with new, high- performance ENERGY STAR® certified windows or inserts. If the frames are still in good condition, inserts (i.e. new sash and glazing units) can be a good option, especially for homes with heritage status. Replacing Glazing, Sashes and Windows Properly installed energy-efficient windows make homes more comfortable by reducing drafts and increasing the temperature of the interior side of the window, reducing condensation. Energy-efficient windows will have many of the following features: double-, triple- or even quadruple-glazing low-emissivity (low-E) glass inert gas,…