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Queenstown police are forensically testing alcohol bottles and cans left around Arrowtown School on Friday night to try to find those responsible for vandalising the premises.
Senior Sergeant Paula Enoka, of Queenstown, said the incident occurred some time after 5pm on Friday.
Two external heat pumps were "kicked and removed'' from the walls, the walls also had large holes made in them, and some walls had been graffitied.
"A small fire [has] also been lit in an open area, not up against the property at all.
"Bottles have been left at the scene - we've still got ongoing inquiries; we've got those bottles here for forensic testing.''
Damage appeared to primarily be focused on a block of classrooms beside an artificial turf court.
Police wanted to hear from anyone who saw or heard anything suspicious on Friday night.