An Adobe Windowframe can be placed on any Foundation, Fence Foundation, Ceiling (with the exception of the Thatch Roof), or another wall.
A Window can be placed in the hole and opened to provide a view of the outside world, or closed to provide protection from projectiles.
A windowframe also provides support to allow a structure built on top of it to extend up to 2 ceilings in any direction on the x and y-axis, and up to 1 ceiling diagonally from a windowframe which is directly above a foundation.
The insulation provided by a house is not decreased by windowframes, whether the window is open, closed, or missing.
If a windowframe is destroyed, any building pieces that rely on it for support will be destroyed as well. If it was destroyed via the demolish option, no resources will be refunded for these extra building pieces.