25 Oct '11, 5am

Green Building Q&A: Semi-detached vs Detached home

There's no way to answer this question in such general terms. Energy usage depends on many variables including when and how a structure was built, design of the thermal enclosure, details of mechanical equipment installed, type of occupancy and occupant behavior. Sharing walls is one way to reduce heat loss in a cold climate, so an attached house will generally consume less energy than a detached house of the same size with similar build quality, similar mechanical equipment and similar occupant behavior. You would have to quantify that on a case by case basis, and it will depend partly on geometry--the percentage of shared surface area for the heated volume of the house. For example a middle rowhouse unit may have a narrow front elevation and a lot of shared wall surface along the sides, which will save a lot of exterior surface relative to heated volume. An end unit will...

Full article: http://www.greenbuildingadvisor.com/community/forum/energ...

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