Rocky Research (Boulder City, NV) has developed an advanced roof top air conditioning unit (RTU) with the potential for providing smart grid functions such as regulation services and PV integration. The RTU contains advanced technologies that have been demonstrated to enable 1) improved coefficient of performance (COP) during start-up transients, 2) improved steady-state efficiency, and 3) blending of DC and AC power with high conversion efficiency. Technologies incorporated by Rocky Research include a pulsing thermal expansion valve (PTXV) to dynamically optimize refrigerant flow, a variable frequency drive (VFD) for the compressor, and on-board integrated power conversion electronics for inverting and blending DC and AC power. A 3-ton Carrier RTU underwent baseline testing to characterize COP with an indoor temperature of 80°F and outdoor temperatures of 95°F and 110°F. The modulating thermal expansion valve was then replaced with Rocky Research’s PTXV, a VFD was added to the compressor, and DC-AC power electronics were included. Baseline testing was repeated, and the following improvements were measured that are relevant for short time-scale (i.e., 90% DC to AC conversion efficiency PNNL then performed a GridLAB-D analysis to determine the impact of frequency regulation on energy consumption for a population of RTUs outfitted with, and without, PTXV and VFD. Simulations show that energy consumption was ~4% lower for RTUs containing PTXV and VFD compared to stock RTUs during frequency regulation (i.e., more frequent cycling).