Accoya casement, storm and sliding sash windows manufactured by Medina Joinery. Accoya® wood is the material of choice for our windows and doors. Not only does it have extremely low thermal conductivity but it is more durable and dimensionally stable than the best tropical hardwoods. It can be opaque coated or, for those wishing to enjoy the natural look of wood, transparent coated. Accoya®’s low maintenance requirements add to its cost effectiveness and environmental credentials.