The k-value measures only the of an item or an assembly and how easily said item or assembly allows heat to pass through it

KW or Kilowatt, is a unit of electric power equal to 1000 watts (see )

A KWh is short for Kilo Watt Hour, which is equivalent to 1000 watts being used for an hour, or a 100-watt bulb being left on for 10 hours.

LEED stands for Leadership in Energy & Environmental Design, which is a voluntary points based program that is administered by the .

Light Reflectance Value (LRV) is a number used to express the amount of visible and usable light reflected by a surface when illuminated by a light source. For example a pure white glossy test card would have a value of a 100 while pure black would equal a 0. Needless to say those combinations are very rare […]

LRV or Light Reflectance Value is a number used to express the amount of visible and usable light reflected by a surface when illuminated by a light source. For example a pure white glossy test card would have a value of a 100 while pure black would equal a 0. Needless to say those combinations are very […]

Net Free Ventilation Area (NFVA) is used to describe the total amount of vent space unobstructed by screens, louvers, or other material. In some cases it will be listed as a total for entire assembly like a gable vent or how much per linear feet for items like a ridge or soffit venting. In order […]

Net Zero refers to a house or building that generates as much energy as it consumes.On the HERS scale that equates to a 0. If a house was to produce more that it uses it would identified with a negative number. This can be a gray area as some consider energy as just the electricity […]

The NFRC or National Fenestration Rating Council basically tests & labels glass products used on buildings like doors, windows, and skylights. For More

NFVA or Net Free Ventilation Area is used to describe the total amount of space unobstructed by screens, louvers, or other material. In some cases it will be listed as a total for entire assembly like a gable vent or how much per linear feet for items like a ridge or soffit venting. In order to calculate the […]