I used to remember that the Jubilee line was relatively tolerable during times of hot weather.
Recently, I have been on a number of trains where the 'blowers' behind the seats aren't blowing out anything at all, e.g. yesterday evening.
I wondered if the driver has any control over them - or do they operate automatically?
Also, I observed a new sign on the train about helping fellow passengers off at the next station if they feel unwell.
95 stock has a cut-out switch for heat and vent, I’d imagine 96 stock has the same. Apart from that they are thermostatically controlled.
The switch is often used if there’s been reports of dust being drawn into cars, some drivers also switch off in order to create a more peaceful atmosphere (although I’d be surprised if anyone was doing that in the current weather).