Not Recommended Recommended Windows Utilizing the inherent energy conserving features of a building by maintaining windows and louvered blinds in good operable Installing new exterior storm windows which are inappropriate condition for natural ventilation. in size or color or which are inoperable. Improving thermal efficiency with weatherstripping, storm Replacing windows or transoms with fixed thermal glazing or windows, caulking, interior shades, and, if historically appropriate, permitting windows and transoms to remain inoperable rather blinds and awnings. than utilizing them for their energy conserving potential. Installing interior storm windows with airtight gaskets, ventilating Using tinted or reflective glazing on character-defining or other holes, and/or removable clips to insure proper maintenance and to conspicuous elevations. avoid condensation damage to historic windows. exterior storm windows which do not damage or Installing obscure the windows and frames. Enclosing porches located on character-defining elevations to create passive solar collectors or airlock vestibules. Such enclosures can destroy the historic appearance of the building. Considering the use of lightly tinted glazing on elevations if other energy retrofitting Removing historic interior features which play a secondary alternatives are not possible. energy conserving role. Entrances and Porches Installing new additions such as multistory solar green house Utilizing the inherent energy conserving features of a building by additions which obscure, damage, or destroy character defining maintaining porches and double vestibule entrances in good features. condition so that they can retain heat or block the sun and provide natural ventilation. Interior Features Apply urea formaldehyde foam or any other thermal insulation with a water content or that may collect moisture into wall Retaining historic interior shutters and transoms for their inherent cavities. energy conserving features. New Additions to Historic Buildings Placing new additions that have an energy conserving function such as a solar greenhouse on elevations. Mechanical Systems Installing thermal insulation in attics and in unheated cellars and crawlspaces to conserve energy. Removing historic shading devices rather than keeping them in an operable condition. Replacing historic multi-paned sash with new thermal sash utilizing false muntins. Installing interior storm windows that allow moisture to accumulate and damage the window.
Recommended Not Recommended Windows Utilizing the inherent energy conserving features of a building by maintaining windows and louvered blinds in good operable condition for natural ventilation. Improving thermal efficiency with weatherstripping, storm windows, caulking, interior shades, and, if historically appropriate, blinds and awnings. Installing interior storm windows with airtight gaskets, ventilating holes, and/or removable clips to insure proper maintenance and to avoid condensation damage to historic windows. Installing exterior storm windows which do not damage or obscure the windows and frames. Considering the use of lightly tinted glazing on elevations if other energy retrofitting alternatives are not possible. Entrances and Porches Utilizing the inherent energy conserving features of a building by maintaining porches and double vestibule entrances in good condition so that they can retain heat or block the sun and provide natural ventilation. Interior Features Retaining historic interior shutters and transoms for their inherent energy conserving features. New Additions to Historic Buildings Placing new additions that have an energy conserving function such as a solar greenhouse on elevations. Mechanical Systems Installing thermal insulation in attics and in unheated cellars and crawlspaces to conserve energy. Removing historic shading devices rather than keeping them in an operable condition. Replacing historic multi-paned sash with new thermal sash utilizing false muntins. Installing interior storm windows that allow moisture to accumulate and damage the window. Installing new exterior storm windows which are inappropriate in size or color or which are inoperable. Replacing windows or transoms with fixed thermal glazing or permitting windows and transoms to remain inoperable rather than utilizing them for their energy conserving potential. Using tinted or reflective glazing on character-defining or other conspicuous elevations. Enclosing porches located on character-defining elevations to create passive solar collectors or airlock vestibules. Such enclosures can destroy the historic appearance of the building. Removing historic interior features which play a secondary energy conserving role. Installing new additions such as multistory solar green house additions which obscure, damage, or destroy character defining features. Apply urea formaldehyde foam or any other thermal insulation with a water content or that may collect moisture into wall cavities.