Survey on Households and the Environment 
Classification by characteristics of the reference person
Percentage of dwellings with thermal insulation or energy-saving lights, by level of studies completed by the reference person and type of insulation or lighting
Units: %  over the total number of dwellings

;With some type of thermal insulation;Canopies;Persian blinds or shutters;Tinted glass or solar protectors;Double glazing for windows;Thermal bridge breaking;With some type of energy-saving lights;Fluorescent tubes or lights;Other energy-saving lightbulbs;
TOTAL;96.2;23.0;94.0;4.1;39.3;11.4;85.5;66.1;67.1;
Without studies;93.3;17.1;91.8;2.1;19.0;4.9;69.0;55.9;41.1;
Primary education or the equivalent;96.0;21.2;94.1;3.7;37.1;9.1;86.1;70.1;63.5;
Stage one secondary education;96.8;23.5;95.2;4.3;35.4;8.5;84.4;63.0;68.6;
Upper-secondary education;95.8;26.2;93.4;4.2;43.2;12.2;89.0;66.9;74.3;
Intermediate level-professional education;97.2;21.4;95.5;5.3;48.9;14.2;90.7;71.1;76.1;
Higher level -professional education;97.3;25.1;94.6;5.1;50.5;19.7;94.5;69.4;80.9;
1st cycle university studies;97.5;27.8;94.6;5.8;51.9;17.8;91.6;68.6;79.5;
2nd or 3rd cycle university studies;98.4;28.6;94.9;5.1;53.9;19.5;92.1;65.9;82.3;
Does not know/ Does not answer;100.0;.;96.7;.;53.1;.;49.8;49.8;27.9;
Notes:

.Data protected by statistical secrecy

Source: National Statistics Institute