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  1. Heating, Ventilation, and Air Conditioning (HVAC)

    A discussion of residential system zoning. 46 ...

  2. Water

    water usage. A home's lawn and garden is the largest consumers of water in a typical household (46 ...

  3. Geothermal

    (COP). A COP greater than 4.6 or 3.6 are considered energy efficient for open loop and closed loop ...