ENSURING CUSTOMER SATISFACTION WITH LOW-E INSULATING
GLASS IN RESIDENTIAL APPLICATIONS
Insulating glass with Low-E coatings
has become so popular because of obvious performance benefits – heating
and cooling cost savings, greater occupant comfort, reduced fading of
interior fabrics and wood floors. Additionally, Low-E coatings are
required for insulating glass to meet the Energy Conservation
Construction Code of New York State and always required to meet Energy
Star Criteria in the northern climate zone.
But especially in residential
applications, the appearance of the glass may be equally, or more
important to the home owner—particularly in critical viewing areas,
like big “picture windows.”
We offer two Low-E products.
Pilkington Energy Advantage offers
the highest light transmission, and looks closest to clear glass. It is
our least costly Low-E product and has a U-factor of .33 with a 1/2”
airspace (.29 Argon). But if the glass is partially shaded as
occurs during a rising or setting sun, the coating exhibits a “haze” in
the sunlit portion of the glass.
Guardian ClimaGuard RLE 71/38 is less
subject to “haze.” But it looks darker than clear glass. It provides a
better U-factor of .29 (.25 Argon). It blocks more solar heat.
Both are great products. But each may
disappoint an uninformed customer. And neither product will most likely
match adjacent glass in appearance, so replacement of adjacent glass is
recommended if a match in appearance is important.
Glenny Glass recommends that Low-E
glass options be discussed with customers so that the performance
benefits and appearance can be weighed, resulting in an informed
decision and full satisfaction.
“Haze” in Pilkington
partially sunlit area.
Lower Light Transmission in Guardian RLE