Window
Comparison
Comparison
See for yourself how we measure against the competition. Review the
following comparisons of our windows to the competition. Our windows are
30-50% better than the best competition, the numbers don't lie, only people do!
The following are comparisons of U-Factor values, Solar Heat Gain
Coefficients, and Visible Transmittance ratings for NFRC Certified Double Hung
Windows.
following comparisons of our windows to the competition. Our windows are
30-50% better than the best competition, the numbers don't lie, only people do!
The following are comparisons of U-Factor values, Solar Heat Gain
Coefficients, and Visible Transmittance ratings for NFRC Certified Double Hung
Windows.
 |
| |
 |
| |
 |
| |
 |
| |
 |
| |
 |
| |
 |
| |
 |
| |
 |
| |
 |
| |
 |
| |
 |
| |
 |
| |
 |
| |
 |
| |
 |
| |
 |
| |
 |
| |
 |
| |
 |
| |
 |
| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| ||||||||
| Copyright © 2009 All-Weather Seal West. All Rights Reserved. |
U-Factor
A measure of the rate of non-solar heat loss or gain through a
material or assembly. It is expressed in units of Btu/hr-sq ft-ºF
(W/sq m-ºC). Values are normally given for NFRC/ASHRAE winter
conditions of 0ºF (18º C) outdoor temperature, 70º F (21º C)
indoor temperature, 15 mph wind and no solar load. The U-
factor may be expressed for the glass alone or the entire window,
which includes the effect of the frame and the spacer materials.
The lower the U-factor, the greater a window’s resistance to heat
flow and the better its insulating value.
A measure of the rate of non-solar heat loss or gain through a
material or assembly. It is expressed in units of Btu/hr-sq ft-ºF
(W/sq m-ºC). Values are normally given for NFRC/ASHRAE winter
conditions of 0ºF (18º C) outdoor temperature, 70º F (21º C)
indoor temperature, 15 mph wind and no solar load. The U-
factor may be expressed for the glass alone or the entire window,
which includes the effect of the frame and the spacer materials.
The lower the U-factor, the greater a window’s resistance to heat
flow and the better its insulating value.
Solar Heat Gain Coefficient (SHGC)
The fraction of solar radiation admitted through a
window or skylight, both directly transmitted and
absorbed and subsequently released inward. The
solar heat gain coefficient has replaced the shading
coefficient as the standard indicator of a window’s
shading ability. It is expressed as a number between
0 and 1. The lower a window’s solar heat gain
greater its shading ability. SHGC can be expressed
in terms of the glass alone or can refer to the entire
window assembly.
The fraction of solar radiation admitted through a
window or skylight, both directly transmitted and
absorbed and subsequently released inward. The
solar heat gain coefficient has replaced the shading
coefficient as the standard indicator of a window’s
shading ability. It is expressed as a number between
0 and 1. The lower a window’s solar heat gain
greater its shading ability. SHGC can be expressed
in terms of the glass alone or can refer to the entire
window assembly.
Visible transmittance (VT)
The percentage or fraction of the visible spectrum (380 to 720
nanometers) weighted by the sensitivity of the eye that is
transmitted through the glazing.
The percentage or fraction of the visible spectrum (380 to 720
nanometers) weighted by the sensitivity of the eye that is
transmitted through the glazing.
Toll Free:
1-877-SEAL-711
1-877-SEAL-711
Lowell, MI
319 E. Main St.
Also Serving:
Grand Rapids, Muskegon, Kalamazoo, Holland, Big Rapids, Ludington,
St. Joseph, Battle Creek, Ionia and all of West Michigan
