This project involves replacing the HVAC system in Building 198 at NSWC Crane, Indiana, to maintain humidity between 40-60% for ordnance prototype development. The work also includes internal renovations in adjacent Buildings 2507 and 2508, with new equipment pads and extended chiller pads. The construction duration is 692 calendar days from the notice to proceed, with a firm-fixed-price contract anticipated between $1,000,000 and $5,000,000. Performance will occur at NSA Crane in Indiana, primarily within Building 198 and supporting buildings. The procurement is full and open competition, with award based on the lowest price.