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Heating and cooling systems have energy costs, and window films can be used to increase building insulation. Modern windows with low-solar-gain glass do not need retrofit films, but since most of the existing windows do not have a low solar heat gain, window films make a lot of sense as a retrofit energy improvement. [8]
A window screen (also known as insect screen, bug screen, fly screen, flywire, wire mesh, or window net) is designed to cover the opening of a window. It is usually a mesh made of metal, fibreglass , plastic wire, or other pieces of plastic and stretched in a frame of wood or metal.
Storm windows can be very cost effective in cold climates. They are inexpensive, and can reduce heat loss by up to 50%, increasing the building's comfort and reducing the heating costs. They also reduce exterior air infiltration significantly.
These mounting systems generally enable retrofitting of solar panels on roofs or as part of the structure of the building (called BIPV). [2] As the relative costs of solar photovoltaic (PV) modules has dropped, [3] the costs of the racks have become more important and for small PV systems can be the most expensive material cost. [4]
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The CIS Tower in Manchester, England was clad in PV panels at a cost of £5.5 million. It started feeding electricity to the National Grid in November 2005. The headquarters of Apple Inc., in California. The roof is covered with solar panels.