House as a System
Technology Snapshot & Benefits:
When building new energy-efficient houses or making
existing houses more efficient significant energy gains can be realized, just by
treating the "House as a
System". You cannot make changes to one part of a house without affecting the
many other parts that make up the house system. The house system is made up of
the building envelope (foundation, walls, ceiling), the heating and cooling
system, the water heating system, the lighting system, the appliances, and a
fireplace if present.
Estimated Cost Savings:
home as tight as possible has an incredible impact on your heating and cooling
Tight homes need sealed-combustion furnaces and
water heaters or outside air for combustion in
wood-burning fireplaces. Common mistakes include putting non-sealed combustion furnaces and water heaters
or wood-burning fireplaces in tight energy-efficient homes. With a tight house,
something as simple as turning on your dryer or a down-vented range can pull the
ashes and combustion by-products right out of the fireplace or down the chimney
of the furnace or water heater and back into the house.
Increasing the insulation in a wall or attic without sealing the air leaks
from the inside into that space can lead to mold and rotting problems.
Proper roof insulation is important to prevent ice damming on roofs.
In cold climates, sealing penetrations on the inside into walls and attics is
important in keeping the moist inside air from getting into the cold spaces and
condensing. In warm climates, it works the other way around. You need to keep warm
moist outside air from reaching the back of the drywall that can be colder due
to air conditioning.
Sealed combustion appliances are a must for any climate region.
Installation (Getting It Done):
With a new house, you want to build it as tight as possible. Install sealed
combustion gas appliances and a controlled ventilation system.
More Information On This Topic:
Building Science Corporation: House
Design Recommendations by Climate Region
Building Science Corporation's guidelines for quality energy-efficient design
and Environmental Building Association Criteria
The Energy and Environmental Building Association (EEBA)
goals, objectives and criteria for energy and resource efficient buildings. They provide guidance for design, construction and comprehensive
rehabilitation (gut-rehab) of low-rise residential and small commercial
buildings less than 20,000 square feet (1,900 m2) floor area.