ROCKLAND, Maine — Oceanside High School continues to undergo some of the most extensive renovations since the 54-year-old school was built.

A total of $2.5 million in work is being performed on the school this year and into next year.

A third of the windows have been replaced with the remainder to be done next year, Superintendent John McDonald said Thursday. The boiler and heating system also have been upgraded to burn high-efficiency propane rather than No. 2 heating oil.

The heating and cooling system is being automated so that the temperatures can be controlled remotely, McDonald said. Once completed, the maintenance director will be able to monitor the school and adjust the environment by using his laptop.

Renovations and upgrades at the high school are part of an overall $8.1 million worth of work throughout Regional School Unit 13, which serves the communities of Rockland, Thomaston, South Thomaston, Owls Head and Cushing. Significant work estimated at $1.4 million also is being done at Oceanside Middle School in Thomaston, which was built in 1963.

The Rockland Elementary School is having $2.2 million worth of energy efficiency projects performed on it. And nearly $1 million of projects is underway at the Thomaston Grammar School.

Siemens Energy is overseeing the projects.