As a school professor, I actually know how greatly the right environment affects learning. Essentially in almost every situation, goals are better met when people function in comfortable environments. This is the reason why so much effort is put into making restaurants more than just locales to eat, & hotels into more than locales to sleep. Nobody would desire to eat in a dirty restaurant, or spend the night in a bug ridden hotel. Image & comfort are entirely pressing & that is why several corporations are equipped with modern, top of the line Heating, Ventilation, & A/C equipment. Where I happen to teach, I try to keep my classroom as clean & as charming as I am able to. However, when the afternoons are completely sizzling & the students are covered in sweat, there is not all that much I can do to change that. Our Heating, Ventilation, & A/C equipment has served us well over the years, but it has been a long time. I am sure that it is worked on quite often, for the Heating, Ventilation, & A/C serviceman is personally known to me. According to him, the school Heating, Ventilation, & A/C equipment has pretty much served its time & needs to be updated really soon. He is suggesting that the outdated AC should be updated by a modern mini split system, so that each classroom would have its own temperature control device. I actually doubt very much that the school will be able to cover the cost of anything so pricey, but an updatement has to be found speedily. I have two portable fans which I use when the environment is very sizzling although I think they are not half as efficient as proper Heating, Ventilation, & A/C equipment would be.