This pre-solicitation notice is for market research to identify potential small-business sources for replacing HVAC rooftop units at Building 2275, 163 ATKW CA ANG, March ARB; it is not a solicitation and no award will result from responses. The work includes replacing six package heat pumps on existing curbs, disconnect switches and conduit, salvaging and reinstalling Automated Logic Control boards, reconnecting fire-alarm smoke detection with testing in the presence of the Base Fire Department, flashing, commissioning, and a five-year parts-and-labor warranty. The contractor must also provide a crane lift plan and FAA ASN approval, with a scheduled three-month review period. The anticipated construction magnitude is between $100,000 and $250,000 under NAICS 238220, with a $19 million small-business size standard. Interested firms are asked to provide a brief written notice of intent plus relevant past-performance, resource, and socioeconomic information directly by email.