Installing thermal insulation in attics and in unheated
cellars and crawlspaces to increase the efficiency of
the existing mechanical systems.
Installing insulating material on the inside of
masonry walls to increase energy efficiency where there
is no interior molding around the windows or other interior
architectural detailing from the restoration period.
Applying thermal insulation with a high moisture content
in wall cavities which may damage historic fabric.
Installing wall insulation without considering its
effect on interior or other architectural detailing.
Utilizing the inherent energy conserving features
of a building by maintaining windows and louvered blinds
from the restoration period in good operable condition
for natural ventilation.
The operable shutters on this 19th century church window provide an acceptable level of energy efficiency for the historic building. Photo: HABS Collection, NPS.
Improving thermal efficiency with weatherstripping,
storm windows, caulking, interior shades, and if historically
appropriate, blinds and awnings.
Installing interior storm windows with air-tight
gaskets, ventilating holes, and/or removable clips to
ensure proper maintenance and to avoid condensation
damage to historic windows.
Installing exterior storm windows which do not damage
or obscure the windows and frames.
Using shading devices that are inappropriate to the
Replacing multi-paned sash from the restoration period
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.
Replacing windows or transoms from the restoration
period with fixed thermal glazing or permitting windows
and transoms to remain inoperable rather than utilizing
them for their energy conserving potential.
Entrances and Porches
Maintaining porches and double vestibule entrances
from the restoration period so that they can retain
heat or block the sun and provide natural ventilation.
On both front and side elevations, this prominent porch helps moderate the effects of the hot, southern climate. Photo: HABS Collection, NPS.
Changing porches significant to the restoration period
by enclosing them.
Retaining interior shutters and transoms from the
restoration period for their inherent energy conserving
Removing interior features from the restoration period
which play a secondary energy conserving role.
Improving energy efficiency of existing mechanical
systems by installing insulation in attics and basements.
Replacing existing mechanical systems that could be
repaired for continued use.
Retaining plant materials, trees, and landscape features
which perform passive solar energy functions such as
sun shading and wind breaks, if appropriate to the restoration
Removing plant materials, trees, and landscape features
from the restoration period that perform passive solar
Maintaining those existing landscape features which
moderate the effects of the climate on the setting such
as deciduous trees, evergreen wind-blocks, and lakes
or ponds, if appropriate to the restoration period.
Stripping the setting of landscape features and landforms
from the restoration period so that effects of the wind,
rain, and sun result in accelerated deterioration of
the historic building.