Specifications include, but are not limited to: The City of San Antonio is soliciting proposals for a qualified contractors to furnish the necessary labor, materials, service equipment, tools, supervision, supplies, transportation, method of communication, and service reports, to provide “on call” filter replacements, to heating, ventilation, and air conditioning (HVAC) systems and HVAC supporting equipment through an on call contracting services (OCCS) contract, also referred to as job order contract (JOC) for the Building and Equipment Services Department (BESD), San Antonio Fire Department (SAFD), and the Convention and Sports Facilities (CSF) Department. The filter replacement services are required to preserve the safety, reliability, and functionality of the equipment at the various City facilities