The US Army Corps of Engineers, Walla Walla District is seeking small business sources for a Blanket Purchase Agreement covering HVAC troubleshooting, repair, and preventative maintenance services. Work will be performed within the Walla Walla District, spanning Idaho, Oregon, and Washington, on systems ranging from wall-mounted PTACs to large industrial water-sourced heat pumps up to 1,500 tons. The applicable NAICS code is 238220, with a small business size standard of $19 million in average annual receipts. Interested firms must demonstrate relevant experience, provide references, confirm their business size and CAGE/UEI, and address questions about technician certifications, subcontractor oversight, emergency response, parts sourcing, and pricing. This is a sources-sought notice for market research only, not a solicitation, and responses will be used to determine whether to set aside the requirement.