Housing conditions and energy efficiency Households according to whether they have an adequate temperature in the housing in cold months or in summer, by size of municipality. Unidades: Percentages. ,Not warm enough during the cold months,Not cool enough during the summer, Total,27,5,33,6, Fewer than 10,000 inhabitants,25,3,26,4, Between 10,000 and 50,000 inhabitants,29,9,33, Between 50,000 and 100,000 inhabitants,28,9,35,8, Between 100,000 and 500,000 inhabitants,26,8,35,3, More than 500,000 inhabitants,26,2,39, Notas: Fuente: Instituto Nacional de Estadística