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