Housing conditions and energy efficiency Households according to whether they have an adequate temperature in the housing in cold months or in summer, by nationality of the reference person. Unidades: Percentages. ;Not warm enough during the cold months;Not cool enough during the summer; Total;27,5;33,6; Spanish;26,9;33,1; Foreign (European Union);25;36,2; Foreign (rest of the world);38,3;40,8; Not specified;0;0; Notas: Fuente: Instituto Nacional de Estadística