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.








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