MPG for Homes May 06, 2009 This article originally appeared in
the May/June 2009 issue of Home Energy Magazine. Energy
conservation can be achieved in two ways: by reducing the amount
of primary energy consumed to supply the useful-energy
requirement (energy efficiency), and by reducing the end point
use of nonessential energy. Energy efficiency in homes can be
increased by improving the thermal performance of the building
and by installing high-efficiency heating-and-cooling equipment,
lighting, and appliances. Unfortunately, incorporating energy
efficiency measures does not automatically reduce energy use.
Although the efficiency of residential building shells, space-
conditioning equipment, lamps, and appliances has improved
significantly in recent years, total residential energy
consumption in the United States is increasing—and this is
projected to continue. Reasons include the increased size of
homes and changes in the number, type, and uses of electrical
and electronic devices. Therefore, it is essentia