What Others Say
"It is far better, for heat gain prevention, to block the sunlight before it reaches the window, thereby dissipating the absorbed heat outside where it can be carried away by the air currents. This means that simple shade trees and other exterior shading methods can be very effective, both in saving air cooling energy and in blocking the strong glare which direct sunlight can produce if allowed inside."
"If the homeowner is considering window film, it is important to realize that some window manufacturers void their warranties if window films are applied to their products. The main reason is that most window films accomplish their solar glare reduction by absorbing solar radiation inside the film, causing it to heat up. Some of the heat in the film will conduct to the glass on which it is applied, causing this glass to expand. If it expands enough, stresses can build up in the window and cause it to fail, most often through a shattering of the glass." (Choosing the Best Residential Window Options for the Florida Climate - Guide for Florida Homeowners, R. McCluney and P. Jindra, Floriday Solar Energy Council, 2002, pp. 3 & 15)
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