Required -- HVAC Unitary skills : Proficiency in split systems (all brands up to 120 tons), mini-split systems (up to 3-ton heat pump and MultiZone), VRV Heat Pump and VRV Heat Recovery, roof top units (all brands up to 150+ tons), water source heat pumps (all brands up to 120 tons), self-contained systems (water-cooled and air-cooled with remote condenser), and CRAC units (Leibert/data-aire/Stultz). Diagnoses HVAC system performance through observation, testing and setup as required by trade/position and type/size of equipment to include split systems up to 120 tons, mini split systems, 3 tons/multizone, VRV heat pump/recovery, RTUS up to 150+ tons, WSHP up to 120 tons, self-contained systems, CRAC units, air/water cooled chillers, airside, AHUs and EFs, pumps and piping.