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KB Home Unveils Efficient ZeroHouse 2.0

KB Home, a publicly-traded home builder with its headquarters in Los Angeles, this month announced the nationwide roll out of net-zero energy home designs called ZeroHouse 2.0.  The standard KB Home with Energy Star certification is built to save homeowners about $1,000 in average annual energy costs, while a ZeroHouse 2.0 design is expected to eliminate monthly electricity charges.

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LSG Intros Glimpse Retrofit LED Downlight

Florida-based Lighting Science Group (LSG) recently announced a new LED product called Glimpse.  The Title 24-compliant downlight is compatible with most 5″ and 6″ recessed cans and can be surface mounted to a J-box as a luminaire.  Glimpse is Energy Star qualified in all model types, according to a press release, and provides up to 20% more light than other products on the market with the 750 lumen package.

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Just Right and Airtight [Building Science]

In an article that’s sure to raise the hackles of the Passive House crowd, Joseph Lstiburek, a principal of Building Science Corporation, says the Passivhaus airtightness requirement – 0.6 ach @ 50 Pa — “doesn’t seem to be based on anything that makes any sense.“  He suggests the following: “if you get below 3 ach @ 50 Pa the comfort problems go away, things become predictable, and you save energy. Add the controlled ventilation piece and the combustion safety piece and nobody dies and nobody gets sick and life is good.“  In other words, remove large holes in the building envelope, install a controlled ventilation system, and use sealed combustion or power vented appliances. 

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