Legal analysis: you can charge after installing air conditioner. As for the rental fee, it is unreasonable unless the school has evidence to prove that these installed air conditioners are rented and not purchased by the school. It is best to give priority to students' opinions and report them to the school dormitory management Committee according to the school dormitory management regulations.

Legal basis: Article 226 of the Criminal Law of People's Republic of China (PRC) commits one of the following acts by violence or threat. If the circumstances are serious, he shall be sentenced to fixed-term imprisonment of not more than three years or criminal detention, and shall also or only be fined; If the circumstances are especially serious, he shall be sentenced to fixed-term imprisonment of not less than three years but not more than seven years and shall also be fined:

(1) buying or selling goods by force;

(2) Forcing others to provide or accept services;

(three) forcing others to participate in or withdraw from the tender and auction;

(4) Forcing others to transfer or purchase stocks, bonds or other assets of companies or enterprises;

(5) Forcing others to participate in or withdraw from specific business activities.