Bathurst West Public School, Eglinton Public School and both the Bathurst and Kelso campuses of Denison College will be among the next 37 schools to be air conditioned, making a total of 959 schools to have benefited since the $500 million began in 2018.

Bathurst High Campus principal Ken Barwick welcomed the announcement, saying teaching and learning were both more difficult in stifling classrooms.

"It's fantastic news," Mr Barwick said.

"Even though Bathurst is not the hottest climate, in those years where we might get a month of extreme temperatures it can be quite unbearable for the teachers and students and make it very difficult to learn.

"The demountable buildings all come with heating and cooling but there is no air conditioning in the other classrooms which date back to 1926 in the main building."

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Mr Barwick said the school had taken a number of measures in recent years to help students and staff during the hottest part of the year.

"It's often when we return to school in February that we might get a very hot end to summer so we'll have all the windows open to catch any breeze," he said.

"We've also supplied water bottles and we took that to the next level by putting in electronic cooling water systems."

Mr Barwick said he had not been given a timeline for the installation of air conditioning but confirmed the Department of Education had already measured up each of the classrooms and taken specifications at the school in preparation for the rollout.

Education Minister Sarah Mitchell said the units to be installed as part of the Cooler Classrooms Program would incorporate "smart systems" technology that offer heating, cooling, and the provision of outside fresh air.

The units will automatically shut-down after hours and will be powered by solar technology and battery storage to off-set energy usage at more than 300 schools.

"Our focus has been on our existing delivery priorities including 611 schools in the hottest parts of NSW," Ms Mitchell said.

"I am pleased that we are now in a position to include an additional 37 schools in the program, enhancing the learning environments for students and teachers at NSW public schools

"... These are complex systems with additional work now to deliver a better system in the long run."

As part of the program, more than 3000 gas heaters are also being removed from classrooms and learning spaces.

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