Incorporating HVAC into a grocery store's CO2 (R744) refrigeration system introduces parallel compression to stabilize medium-temperature (MT) compressor demand during high ambient temperatures. This finding comes from a case study conducted in Montreal by the Canadian-based OEM EVAPCO LMP. The details of the integrated system's installation and operation, which also featured heat and gray water reclaim, were presented at the FMI- The Food Industry Association Energy and Store Development Conference. The presentation was given by Francois Aucoin, Director of Engineering at EVAPCO LMP, and