Demerara window

Demerara windows were built primarily into 18th- and 19th-century Colonial architecture-styled buildings[a] to cool homes in hot climates, such as Guyana, before the invention of air conditioning.

The window design includes perforated sides and louvres to block direct sunlight.

[2][3] They were generally made of pine because the wood was less likely to move than native timbers in heat and humidity.

It was generally made with twelve panes, which is a Georgian-style architectural detail.

[2] In other parts of the Caribbean, particularly the British colonies and territories such as Grenada,[5] the name came to be generally applied to a window that opens outwards from hinges at the top.