This is a sources sought notice for market research, not a solicitation, to determine the availability of Indian Economic Enterprises for HVAC repairs on geothermal furnaces. The contract would be a firm-fixed price, base plus four option years, with performance at the Rosebud IHS in Rosebud, South Dakota. The contractor must be available 24/7 for emergency calls and able to be on site within 4 hours for emergencies. The base period of performance is from August 1, 2026, to July 31, 2027, with four one-year options extending through July 31, 2031. No budget amount is specified.