a/c air conditioner air conditioning appliance cooler cord electrical niche plug retro room single wall air-conditioners air-cons angles appearance arch arched arched windows architectural architecture Australian black block boxes building dark design elements exterior external height heritage high historic historical history masonry old ornamental ornamentation perspectives plain Rooms sepia solid Somber sombre stonework surfaces walls windows b&w black and white abstract AC air architect background cold color conditioner conditioning details dirty duct escape factory flow form gray grey illustration industrial industry interior iron lines macro material metal modern parallel pattern plate rough shiny sidings silver slats slatted steel texture vent ventilation wind