Every June and September, classroom temperatures spike when there is a heat wave.

In a union survey of chapter leaders this September, 276 reported that the temperature inside their schools soared during that month’s heat wave. They reported readings of 86, 89, 92, 98 and 101 degrees.

It is outrageous to expect students to learn and teachers to teach in these circumstances.

The federal Occupational Health and Safety Administration recommends that temperatures in occupied classrooms be between 68 to 76 degrees Fahrenheit. While New York State regulations have long set a minimum temperature of 65 degrees, they set no maximum. The same goes for New York City health guidelines, which have a 68 degree minimum but no upper cap.

In 2017, former Mayor Bill de Blasio unveiled a plan to have “AC for all” in city public schools — and declared the project completed five years later. The city made significant strides during that period, but functioning air conditioning in every classroom was never achieved. According to the chapter leader survey, more than 3,000 rooms had either broken air conditioning or no means of cooling.

The problem will only grow worse given climate change. The city and the state must establish a maximum cap on classroom temperature — and provide functioning air conditioning in every building — so UFT members and their students no longer suffer.