Skanska USA Building has won a $13-million contract to upgrade the central plant at the Westin Peachtree Plaza hotel in downtown Atlanta. The main focus of work will be to replace the 30-year-old boilers and chillers.

Other planned upgrades include removal of all major components of the 73-story hotel’s central heating and cooling systems, and replacement with high-efficiency systems.

Skanska recently finished replacing all 6,350 windows at the hotel, which had been damaged in a tornado in 2008. The central plant renovation will be completed by the end of 2011.