The bidder shall provide HVAC & refrigeration systems maintenance services for all City facilities listed in section 2.3. Monthly services include, but are not limited to, filter changes, routine inspections, and preventative maintenance for all air handlers, Direct Expansion (DX) units, chillers, pumps, cooling towers, exhaust systems, and associated temperature controls. Annual inspections are required to clean drain pans, replace belts, wash condenser coils, and perform detailed assessments of chillers, pumps, and cooling towers. The bidder is responsible for maintaining an up-to-date inventory of all HVAC equipment and ensuring that all required maintenance and inspections are performed. Ice machines at applicable facilities must also be cleaned and filters replaced twice per year.