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Rhvac Online quickly and accurately calculates the heating and cooling loads for residential and small commercial structures. Up to 1000 rooms per project can be divided among multiple systems (air handlers), with each system being able to be divided into zones.  Comprehensive reports include detailed loads on 4 levels: the building, each system, each zone, and each room.  This information includes the tonnage requirements at each level as well as the CFM requirements for both heating and cooling.  You can design duct systems that stand alone or that link to the airflow values determined by the load calculation.