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