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Sealing bypasses
(cracks, gaps, holes), especially around doors, windows, pipes that penetrate the
attic ceiling, and other areas with high potential for heat loss, using caulk, foam sealant, weather-stripping, window film, door sweeps, electrical receptacle gaskets,
and so on to reduce infiltration.
Protecting pipes
from corrosion and freezing. Installing footing drains, foundation waterproofing membranes, interior perimeter drains, sump pump, gutters, downspout extensions, downward-sloping grading, French drains, swales, and other techniques to protect a building from both surface water and ground water.
Providing proper ventilation
to unconditioned spaces to protect a building from the effects of condensation.
Installing roofing, building wrap, siding, flashing, skylights or solar tubes
and making sure they are in good condition on an existing building.
Installing insulation
in walls, floors, and ceilings, around ducts and pipes, around water heaters, and
near the foundation and sill. 
Installing storm doors and storm windows.
Replacing old drafty doors
with tightly sealing, foam-core doors.
Replacing older windows
with low-energy, double-glazed windows.
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