Did you know that more than 5,000 hours of monitored classroom time were recorded above 24°C last summer?
That’s one of the findings from Too Hot to Learn?, Twinview’s new report exploring what real temperature data can reveal about overheating in UK schools.
Twinview analysed data collected across 105 teaching spaces in three schools, covering 32,449 monitored room-hours during the 2026 summer term. More than 5,000 of those hours were recorded above 24°C, equivalent in duration to around 6,074 fifty-minute lessons.
And the issue wasn’t limited to isolated peaks. Across all three schools, temperatures above the study threshold were recorded, with the proportion of spaces above 24°C increasing as the school day progressed. By 15:00, almost one in four monitored spaces was above the study threshold.
These findings raise an important question: are we designing and operating schools for the climate we are getting, rather than the climate we had?
As summers become warmer, understanding what is actually happening inside school buildings will become increasingly important. Temperature data can provide a clearer picture of where and when heat builds up, helping schools and estates teams understand the conditions students and staff are experiencing.
Too Hot to Learn? brings together the data, patterns and wider research to explore what overheating could mean for the future of school buildings, and why real-world evidence needs to be part of the conversation.
Click here to view the report