The contractor must remove outdated heating and electrical components and install new, fully functional systems tailored to each shelter's needs. Work includes replacing existing 10kW, 34K BTU electric heaters in Shelters 1 and 2, installing new non-explosion-proof light and fan switch kits in all applicable shelters, and providing new explosion-proof interior light assemblies in Shelters 2 and 3. All repairs must ensure shelters meet operational requirements for safe storage of petroleum, oil, and lubricants and restore reliable environmental control.