skylights
Ultimate, natural incidence of light in a living room comes at a price. Skylights are often a weak link when it comes to home insulation. Polycarbonate combines the best of both worlds. Solid polycarbonate sheet lets in plenty of light, has good insulating properties and will definitely not have an adverse effect on your heating bills!
The above does not mean, however, that you would have to compromise on safety. Solid polycarbonate sheet is virtually unbreakable. Burglars would not stand a chance if they tried to get in through the roof!