The government is conducting market research to identify qualified commercial HVAC contractors for an existing facility, with the goal of maximizing the use of current building infrastructure through retrofit solutions rather than full replacement. Contractors should have experience evaluating existing HVAC systems and developing solutions that interface with ductwork, electrical systems, controls, structural components, penetrations, condensate systems, and mechanical spaces. They must be able to conduct a site survey and recommend a technically acceptable approach covering equipment sizing, zoning, energy efficiency, system compatibility, controls integration, installation requirements, and long-term maintainability.