Which classes of objects are related with the HVAC systems in an EnergyPlus model?

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I believe that most of the objects in EnergyPlus are actually related to HVAC so that is a lot of objects. Here is a list that can get you started at least. For many EnergyPlus objects the name is made up of pieces using colons to separate them. To shorten this list, a "wildcard" is used in the list below that indicates that all items which start with that name up to the first colon should be considered HVAC related objects.

• AirConditioner:*
• AirLoopHVAC
• AirLoopHVAC:*
• AirTerminal:*
• AvailabilityManager:*
• AvailabilityManagerAssignmentList
• Boiler:*
• Branch
• BranchList
• CentralHeatPumpSystem
• Chiller:*
• ChillerHeater:*
• Coil:*
• CoilPerformance:*
• CoilSystem:*
• CondenserEquipmentList
• CondenserEquipmentOperationSchemes
• CondenserLoop
• Connector:*
• ConnectorList
• Controller:*
• CoolingTower:*
• CoolingTowerPerformance:*
• Dehumidifier:*
• DemandManager:*
• DemandManagerAssignmentList
• DesignSpecification:*
• DistrictCooling
• DistrictHeating
• Duct
• ElectricLoadCenter:*
• EnergyManagementSystem:*
• EvaporativeCooler:*
• Fan:*
• FanPerformance:*
• FaultModel:*
• FluidCooler:*
• FluidProperties:*
• Generator:*
• GroundHeatExchanger:*
• HVACTemplate:*
• HeaderedPumps:*
• HeatExchanger:*
• HeatPump:*
• Humidifier:*
• HybridModel:*
• LoadProfile:*
• NodeList
• OutdoorAir:*
• Pipe:*
• PipingSystem:*
• PlantComponent:*
• PlantEquipmentList
• PlantEquipmentOperation:*
• PlantLoop
• Pump:*
• Refrigeration:*
• SetpointManager:*
• Sizing:Parameters
• TemperingValve
• ThermalStorage:*
• ThermostatSetpoint:*
• UnitarySystemPerformance:*
• WaterHeater:*
• ZoneControl:*
• ZoneHVAC:*
• ZoneTerminalUnitList

You can see each individual name by looking at the Energy+.idd file.