Properly designed in climates with adequate solar gain, these can even be a building's primary heating system.
Lattice light is a compound window pane madeup of small pieces of glass held together in a lattice.
Many windows have movable window coverings such as blinds or curtains to keep out light, provide additional insulation, or ensure privacy. Windows allow natural light to enter, but too much can have negative effects such as glare and heat gain. Additionally, while windows let the user see outside, there must be a way to maintain privacy on in the inside. Window coverings are practical accommodations for these issues.
Modern aluminium window frames are typically separated by a thermal break made of a glass fibre reinforced polyamide. With a 34 mm thermal insulation profile it is possible to reach Uf= 1.3 W/m²K for a metal window. This greatly increases thermal resistance, while retaining virtually all of the structural strength.