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