Envelope Heat Capacity: Heat Capacity is the ratio of the heat added to an                     object to an object to the resulting temperature range. 

       a) Very Light: e.g. Curtain Wall
       b) Light: e.g. Wood Framed
       c) Medium: e.g. Steel Framed
       d) Heavy: e.g. Concrete Thin Layer
       e) Very Heavy: e.g. Concrete Thick layer

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