This is a Request for Proposal for HVAC preventive maintenance services at the Chief of Mission Residence in Singapore under a hybrid firm-fixed-price and indefinite-delivery contract. The U.S. Government will award to the lowest-priced, technically acceptable proposal, potentially without discussions. A mandatory pre-proposal conference and site survey will be held at 8 Leedon Park, Singapore on February 13, 2026. Offerors must possess all necessary Singaporean business licenses and permits and be registered in the System for Award Management (SAM). Proposals must be submitted electronically in specific formats.