The performance standards for summertime overheating in compliance with Approved document L2 for teaching and learning areas are
a) There should be no more than 120 hours when the air temperature in the classroom rises above 28°C
b) The average internal to external temperature difference should not exceed 5°C (i.e. the internal air temperature should be no more than 5°C above the external air temperature on average)
c) The internal air temperature when the space is occupied should not exceed 32°C.