Posted by wit windows on Friday, September 2, 2011,
In :
R-5
What is an R-5 Window?
R-5 windows
are highly insulating windows with a whole-window R-value of 5 (or a
U-factor of around 0.2) and are the top tier of energy-efficient windows
for cold and mixed climates available today.
What is an R-value and U-factor?
An
R-value indicates an insulation's resistance to heat flow. So, the
higher the R-value, the greater the insulating effectiveness. U-factor
is the inverse of R-value. So, the lower the U-factor, the better the
thermal performance of the... Continue reading ...