The budget for this project can be estimated based on the scope of work and the type of equipment required. The project involves the replacement and installation of new HVAC systems at six fire stations, which could require a significant amount of labor, materials, and equipment. The cost of the equipment, including the HVAC systems, ductwork, and electrical components, could range from $500,000 to $1,500,000. The labor costs, including the installation, commissioning, and testing of the systems, could add another $200,000 to $500,000 to the total cost. Additionally, the contractor may need to obtain permits, inspect the systems, and perform other tasks, which could add to the overall cost. Based on these estimates, the total budget for this project could range from $700,000 to $2,000,000.