Title: Lower Monumental Powerhouse (PH) HVAC System Upgrade The work is located at the Lower Monumental Dam Powerhouse, Kahlotus, Washington. The solicitation will be issued as a Lowest Price Technically Acceptable (LPTA) Request for proposals (RFP) and result in a single firm-fixed price construction contract. This procurement is unrestricted. Competition is open to both large and small business concerns. A small business subcontracting plan is required for large businesses. 100% performance and payment bonds will be required for this project. The North American Industry Classification System (NAICS) code for this project is 238220 Plumbing, Heating, and Air-Conditioning Contractors and the associated small business size standard is $19,000,000. Solicitation number W912EF26RA007 will be posted to the SAM.gov Contract Opportunities website on or about mid to late July 2026. The proposal due date will be contained in the solicitation and any solicitation amendments that may issued. The solicitation will be made available for download on the SAM.gov Contract Opportunities website. Offerors are responsible for checking the referenced page for any updates to the Notice. The Government is not responsible for any loss of Internet connectivity or for an offeror's inability to access the documents posted at the referenced website. Proposals will be due approximately 30 days after the solicitation is posted. The exact proposal due date will be indicated in the solicitation. System for Award Management (SAM): Offerors must register in the SAM at https://sam.gov/content/home prior to receiving an award. NOTE: The response date that is required to post this notice is not in any way a due date for any submission. This is a pre-solicitation notice only. The Scope of Work: The work will provide a modernized HVAC system that will ventilate, heat, and cool the spaces in the powerhouse using river water for both heating and cooling sources. The new system must allow for efficient powerhouse pressurization to reduce smoke and dust ingress into the powerhouse, prolonging equipment life for many assets and providing for good indoor air quality for occupants. The occupied spaces must be provided with sufficient ventilation, comfort heating and comfort cooling. The control room and stairwells must be provided with a system that will be capable of pressurizing those spaces with clean outside air for the exclusion of smoke during a fire event anywhere in the powerhouse in addition to providing sufficient ventilation, comfort heating and comfort cooling. Update the HVAC control system to a modern electronic control system which can be operated from the control room to significantly reduce the effort required to operate the system. Provide permanent access platforms for efficient access to system components for maintenance, such as the maintenance of the dampers in the mixed air plenum and replacement of air filter media in the perceptron room. THE GOVERNMENT RESERVES THE …