How efficient are Sun Screens vs. Window Film?

OUR WINDOW TREATMENT EXPERIMENT

Both bedrooms are similar in size, west facing, with the same window arrangements. On window #1 we installed an exterior sun screen, on window #2 we installed interior window film.

We turned off fans and lights in both bedrooms and placed a drinking glass in the light shining on the floor to measure both the temperature of the windows themselves and objects in the room. We measured the same panel of glass in each experiment and we measured identical panels in each room.


August 18, 2003 - afternoon high 107 degrees


TIME
PLACE
ITEM
TEMPERATURE
2:40pm
Bedroom #1
Window Temperature
Glass Temperature
93
83
 
Bedroom #2 Window Temperature
Glass Temperature
102
83
4:00pm
Bedroom #1
Window Temperature
Glass Temperature
98
85
 
Bedroom #2 Window Temperature
Glass Temperature
113
85
4:50pm
Bedroom #1
Window Temperature
Glass Temperature
99
85
 
Bedroom #2 Window Temperature
Glass Temperature
108
84

Conclusion: Window in bedroom #2 was substantially hotter to the touch but both treatments work well and offer relief from the sun. The way the light looks and feels with the window film is a softer, more diffused light, however the privacy of the screens and the fact that they cut more heat from entering the home may be a more attractive option for your investment.

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Rosie and Romey Romero, Every Arizona Homeowners Best Friend
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