This is a call for Expressions of Interest for the replacement and upgrade of HVAC systems at facilities CFA-608 and CFA-609 at the Idaho National Laboratory. The work involves replacing outdated steam boilers with electric boilers, installing modern controls, and replacing specific unit heaters. The deadline for submitting an Expression of Interest is May 1, 2026. The performance location is the Idaho National Laboratory. Selected respondents may be invited to participate in a subsequent Request for Quote process.