Energy Masters Home Performance #2
. House was cold
in the winter; children’s bedrooms upstairs particularly uncomfortable.
. They wanted to
What We Found
. Air leakage
moderate as determined with a blower door test but with some connections
between attic and living space, especially at the attic hatch.
. Leaky duct
system; remote plenums (“pressure drop boxes”) in the duct system reduced air
flow and created comfort problems.
These leaks in the duct system not only
waste energy, they can transport pollutants from the attic to the living space
Air is a fluid and, like water, takes the
path of least resistance. These remote plenums restrict air flow, wasting
energy. They also sometimes blow apart to dump conditioned air into attics or
installed and insufficient attic insulation:
Insulation not in contact with ceiling
doesn’t work! Gaps totaling 7% of attic floor reduces R-value by 50%. It also
has to be at the recommended depth for the climate zone
. Air exchange in
house lower than it should have been to provide a healthful indoor environment.
. Bird droppings
and remains of dead birds could compromise the healthfulness of air entering
the home because leaks in the duct system can transport polluted air to the
What We Did
. Air sealed
attic penetrations with expandable foam or other material. Installed weathstrip
around attic hatch and insulated the hatch with rigid insulation glued in
attic fiberglass batts so that they were in contact with surface they were
supposed to insulate then blew in additional cellulose insulation over the top to
fill in gaps and voids to achieve a uniform value of R-49.
. Removed remote
plenums “pressure drop boxes” and replaced them with “Y” connections for better
. Sealed the duct
. Client opted to
replace standard ventilating fan in laundry room with a low-sone,
energy-efficient model we recommended that ventilates the house on a continual
. Reduced random
air leakage by 15%.
. Improved the
comfort of the home and ensured healthful indoor air quality.
annual savings of 265 therms of gas ($236 in today’s energy pricese).
. 12% Simple
Return on Investment (in today’s energy prices).
approximately 3,456 lbs of carbon annually.