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WINDOW FILM LOWERS COOLING COSTS


The cost of cooling your home due to the heat gained through windows can make up about 40% of your summer utility bill. Window film can help protect you from solar heat gain by reflecting the heat, which helps lower energy consumption. GILA Heat Control Platinum window film can help you save an average of $99 on summer cooling costs!

The effectiveness of GILA window film in reducing utility bills and energy consumption vary according to market and climate. The map below provides an overview of approximate savings in several markets around the United States. These figures were calculated using the Lawrence Berkeley National Labs RESFEN 3.1 study model.

 

 

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 GILA Heat Control Platinum 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.
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