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Attached sunspaces are widely employed in the higher floors of traditional residences in the North of Spain. More specifically, in Asturias, it is easy to find them south-oriented and cantilever-positioned. This helps to take the greatest advantage of sun rays, especially during long winter months, and provides a ground-leveled, rain-protected, arcaded space. The function of such space is being a passing area (if it is to be found in a city house), or an exterior mudroom (if it is to be found in a country estate). With respect to the thermal impact of attached sunspaces in inner comfort condition, it is worth determining whether they are truly valuable elements, suitable to be employed in contemporary passive residences in the Atlantic area, or if their climate-dependant performance invalidates such use.