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tricity you buy,” said Farkas. “And to do that, you must consider the entire house’s energy efficiency, not just that of a planned addition. You need to look at the - house as a single energy system — rather than as a collection of independent components and equiment. High-efficiency windows will be a waste of money, if the attic has no, or too little insulation. Each component affects the others. And for better or worse, a planned addition will become inter-connected with the house’s existing system.”
When you sit down to analyze your house’s energy-efficiency aspect, you have three areas to consider.
• Tighten the House’s Thermal Envenlope.
• Specify High-Efficiency Electric Appliances.
• Install Controls for Efficient Electricity Use.
Sealing the Envelope
A house’s thermal envelope includes its roof, walls, windows and doors, insulation (ceiling, walls, floors over unconditioned crawl spaces), ventilation, and caulking, weather-stripping — everything that separates the inside from the outside. Each of these elements directly affects your house’s heating and cooling loads — as well as its comfort, quiet, and overall value.
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