How do window shades and in particular exterior solar shades play a role in “sustainable design”? To understand the role that these shades play, we need to understand what is sustainable design. A good definition comes from the AIA website where it states that “sustainable design is a collaborative process that involves thinking ecologically— studying systems, relationships, and interactions—in order to design in ways that remove rather than contribute stress to systems”.
The last part of that statement – in order to design in ways that remove rather than contribute stress to systems – has an important association to exterior solar shades. This next generation in window coverings succeeds as a sustainably designed solution because it removes stress to systems by reducing over 85% the amount of solar energy entering a space and thereby reducing the amount of energy required for cooling. This is a certain qualifier for making the exterior solar shade a sustainable solution.
It is true that putting any type of solar shade fabric on the exterior side of a window can reduce solar heat gain. However, the critical question to ask is: What type of exterior solar shades are the best at reducing solar heat gain as well as, withstand high winds, have a long useful lifespan, is easy to maintain and provides a quick return on investment? Let’s examine these challenges to determine the three best exterior solar shade solutions.
High Winds
Any kinetic device installed on a building’s façade must be able to survive windy conditions. This does not mean that the shades can be fully open and functioning with winds gusts higher then 35 miles per hour, which are as a reference point, tropical depression levels.
Exterior solar shades have an important backup safety device, the wind sensor. The wind sensor is installed along with the shade to send a signal to the motor to retract the shades when gusts of wind hit a specific preset limit. For all of our systems we recommend that 30-35 miles per hour should be a standard setting. While some systems can withstand winds far in excess of 35 MPH, there is no need to have a shade down during such stormy conditions and if the shade is very tall, it may take about a minute or so for the shade to fully retract leaving the system potentially exposed for that period of time.

Wind & Sun Sensor