A house is a residential building, and the cited article says it may range in complexity from a rudimentary hut to a complex structure of wood, masonry, concrete or other material, outfitted with plumbing, electrical, and heating, ventilation and air conditioning systems. Houses use a range of roofing systems to keep precipitation such as rain out of the dwelling space, and generally have doors or locks to secure the space and protect its inhabitants and contents from burglars or other trespassers. Most conventional modern houses in Western cultures contain one or more bedrooms and bathrooms and a kitchen. Buildings recorded in the atlas as houses are grouped under this concept.