In recent times, the glass panels or facades are sometimes seen as more efficient than the traditional bricks in maintaining the energy balance of a building. Consider the following statements in this context:
1. Use of double-insulated glass windows is more energy efficient in comparison to plane glass windows
2. The primary use of Electrochromatic Glass in architecture is to save costs of heating, air-conditioning and lighting
Which among the above statements is / are correct?
[A]Only 1
[B]Only 2
[C]Both 1 & 2
[D]Neither 1 nor 2

Both 1 & 2
Use of Glass in Buildings This is a commonsense based question. •Statement 1: There have been instances of not-so-well planned glass buildings that end up consuming high electricity for air conditioning, as often the glass lets in too much heat. Use of new types of architectural glasses like low heat glass panels (glass panels that reflect most of the heat back and provide maximum light inside) and sandwich panels which have double-insulated glass windows to cut out the heat as well as sound should be used. •Statement 2: Smart glass technologies include electrochromic devices, suspended particle devices, micro-blinds and liquid crystal devices. The use of smart glass can save costs for heating, air-conditioning and lighting and avoid the cost of installing and maintaining motorized light screens or blinds or curtains. When opaque, liquid crystal or electrochromic smart glass blocks most UV, thereby reducing fabric fading; for SPD-type smart glass, this is achieved when used in conjunction with low emissivity coatings.