Nationality of the reference person	Improvements to thermal insulation or the heating system	Total
Total	Has made improvements to thermal insulation or the heating system	14,1
Total	No improvements have been made and it is warm enough during the cold months	60,8
Total	No improvements have been made and it is not warm enough during the cold months	25,1
Spanish	Has made improvements to thermal insulation or the heating system	14,5
Spanish	No improvements have been made and it is warm enough during the cold months	60,9
Spanish	No improvements have been made and it is not warm enough during the cold months	24,5
Foreign (European Union)	Has made improvements to thermal insulation or the heating system	11,6
Foreign (European Union)	No improvements have been made and it is warm enough during the cold months	65,4
Foreign (European Union)	No improvements have been made and it is not warm enough during the cold months	23,1
Foreign (rest of the world)	Has made improvements to thermal insulation or the heating system	8,9
Foreign (rest of the world)	No improvements have been made and it is warm enough during the cold months	55,1
Foreign (rest of the world)	No improvements have been made and it is not warm enough during the cold months	36
Not specified	Has made improvements to thermal insulation or the heating system	51,5
Not specified	No improvements have been made and it is warm enough during the cold months	48,5
Not specified	No improvements have been made and it is not warm enough during the cold months	..