The VA Nebraska-Western Iowa Medical Health Care System, Omaha VA Medical Center, needs to replace the existing HVAC R-410A split system in building 6 with a new R-410A system and in building 8 replace the HVAC unit with a new R-454B system, to meet A2L requirements. Additionally, a new mini-split system will be installed in the basement of building 6 to provide cooling in the mechanical room.