|
|
|
|
Cooling Cost
Without Film
|
Cooling Cost
With Film
|
Cooling Cost
Savings
|
Electricity $/kwhr
|
|
Atlanta
|
$230
|
$143
|
$87
|
$0.082
|
|
Boston
|
$116
|
$50
|
$66
|
$0.130
|
|
Chicago
|
$159
|
$77
|
$82
|
$0.122
|
|
Dallas
|
$417
|
$290
|
$127
|
$0.088
|
|
Denver
|
$110
|
$56
|
$54
|
$0.078
|
|
Kansas City
|
$240
|
$147
|
$93
|
$0.086
|
|
Los Angeles
|
$62
|
$16
|
$46
|
$0.134
|
|
Miami
|
$556
|
$397
|
$159
|
$0.072
|
|
New York
|
$202
|
$116
|
$86
|
$0.132
|
|
Phoenix
|
$1,010
|
$750
|
$260
|
$0.118
|
|
San Diego
|
$109
|
$47
|
$62
|
$0.116
|
|
Washington, D.C.
|
$141
|
$79
|
$62
|
$0.072
|
|
Average
|
$279
|
$181
|
$99
|
$0.103
|
Above
costs DO NOT INCLUDE costs for hot water, lighting, and appliances
(dishwasher, refrigerator, freezer, clothes washer, or dryer, etc.).
Values
used in RESFEN model:
- 2,000 sq. ft., 2 story
existing frame home, 300 sq. ft. of windows evenly divided between
North, South, East, and West.
- Energy costs are based on
2006 expected costs per kwhr for electricity for each location.
- Single pane clear window
without film: U-value 0.87, Solar Heat Gain Coefficient 0.63.
- Single pane clear window
with LLUMAR® Heat Control Neutral film: U-value 0.68, Solar Heat Gain
Coefficient 0.22.
- Window U-values and SHGC
take into account the effect of the window framing system. Model is
based on double-hung, 3ft. x 4ft. vinyl windows. U-value and SHGC were
calculated using LBNL Window 4.1.
- Air infiltration for
windows set to 0.30 cfm per sq. ft. for both windows with and without
film.
- Solar Gain Reduction set to
typical for both windows with and without film. This provides for some
external and internal shading of windows and reduces the overall effect
of adding solar film, but provides a truer value of savings.
|
