Get a zone defense
You can program them to respond to your use patterns, cutting your energy bills by nearly 10%, according to data from Energy Star, a government program that sets efficiency standards.
If you want to get fancy, you can divide your house into multiple climate zones so that you heat or cool only the rooms that need it.
In summer you can focus the air conditioning on bedrooms and spaces that get the most sun.
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Last updated August 22 2008: 9:53 AM ET
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