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The ASHRAE 2021 Annual Conference originally scheduled to be held June 26-30, 2021 in Phoenix, AZ is now going to be held online in a virtual format. The conference will include a mixture of live and on-demand technical and interactive sessions that will take place Monday, June 28-30, 2021. The 2021 Virtual Annual conference will focus on critical environments, hot climates, and future proofing. The technical program, including the research summit and professional development, fosters sharing of knowledge to allow us all to serve our communities and solve society’s greatest challenges.