Staff and pupils at schools across Northern Ireland have been told to "wear more clothes" if it is cold in order to cut heating bills.
Schools have been told by the Education Authority (EA) to reduce heating and lighting "wherever possible".
The authority has said that school gas and electricity bills are set to rise by about £8m by March 2027.
The EA has written to school heads warning that increasing costs will affect school energy bills.
Kirsty Logan-Hall says her school is in an older building which presents energy efficiency challenges