Survey on Households and the Environment Classification by characteristics of the reference person Percentage of dwellings with thermostat heating or air-conditioning, by level of studies completed by the reference person and average room temperature programmed during the day Units: % over the total number of dwellings Availability of thermostat heating Average temperature of heating during the day Availability of air-conditioning Average temperature of air-conditioning during the day TOTAL 48.7 21.3 35.5 22.3 Without studies 29.1 21.4 23.5 22.5 Primary education or the equivalent 48.0 21.1 30.7 22.4 Stage one secondary education 40.7 21.8 44.2 22.5 Upper-secondary education 54.9 21.4 37.0 22.1 Intermediate level-professional education 56.0 21.5 42.1 22.2 Higher level -professional education 59.0 21.0 37.6 22.2 1st cycle university studies 61.4 21.6 43.7 22.3 2nd or 3rd cycle university studies 62.2 21.3 43.4 22.3 Does not know/ Does not answer 96.7 20.0 21.9 24.0 Notes: Source: National Statistics Institute