Sunlight and Vastu-IV

The use of heat: interception glass permits the use of large window walls with less heat penetration than allowed by ordinary glass. A relatively light, colored heat, absorbing glass intercepts over 40% of the radiant energy. This is a considerable aid in summer cooling, but unfortunately it also represents a loss of useful heat in winter.  Thus we must aware about effects of sunlight during construction of building and finally fitting of glasses etc.