# Building

- [Levels](/user-guide/2d-building/building/levels.md): Levels are where you manage and organise key elements of your model, including the distribution of drawings, placement of daylight grids, roof geometry and other shading features.
- [Manage Levels](/user-guide/2d-building/building/levels/manage-levels.md)
- [Daylight Grids](/user-guide/2d-building/building/levels/daylight-grids.md)
- [Roof Geometry](/user-guide/2d-building/building/levels/roof-geometry.md): Roofs can be complex to model, but this section covers everything you need to know to add and customise roof geometry with confidence.
- [Create a Roof](/user-guide/2d-building/building/levels/roof-geometry/create-a-roof.md)
- [Add Roof Windows](/user-guide/2d-building/building/levels/roof-geometry/add-roof-windows.md)
- [Add Custom Eaves](/user-guide/2d-building/building/levels/roof-geometry/add-custom-eaves.md)
- [Add Skylights](/user-guide/2d-building/building/levels/roof-geometry/add-skylights.md)
- [Specify a Skylight](/user-guide/2d-building/building/levels/roof-geometry/specify-a-skylight.md)
- [Calibrate Underlay](/user-guide/2d-building/building/levels/roof-geometry/calibrate-underlay.md)
- [Shading](/user-guide/2d-building/building/levels/shading.md)
- [Groups](/user-guide/2d-building/building/groups.md)
- [Spaces](/user-guide/2d-building/building/spaces.md)
- [Create a Space](/user-guide/2d-building/building/spaces/create-a-space.md)
- [Add Occupants](/user-guide/2d-building/building/spaces/add-occupants.md)
- [Add Lights](/user-guide/2d-building/building/spaces/add-lights.md)
- [Add Equipment](/user-guide/2d-building/building/spaces/add-equipment.md)
- [Set Infiltration](/user-guide/2d-building/building/spaces/set-infiltration.md)
- [Set Ventilation](/user-guide/2d-building/building/spaces/set-ventilation.md)
- [Set Thermostats](/user-guide/2d-building/building/spaces/set-thermostats.md)
- [Set Humidistat](/user-guide/2d-building/building/spaces/set-humidistat.md)
- [Set Sizing](/user-guide/2d-building/building/spaces/set-sizing.md)
- [Add HVAC](/user-guide/2d-building/building/spaces/add-hvac.md)
- [Set a Purpose](/user-guide/2d-building/building/spaces/set-a-purpose.md)
- [Set a Building Class](/user-guide/2d-building/building/spaces/set-a-building-class.md)
- [HVAC](/user-guide/2d-building/building/hvac.md)
- [Plant HVAC](/user-guide/2d-building/building/hvac/plant-hvac.md)
- [Air Handling Unit](/user-guide/2d-building/building/hvac/plant-hvac/air-handling-unit.md)
- [Supply Air Fan](/user-guide/2d-building/building/hvac/plant-hvac/air-handling-unit/supply-air-fan.md)
- [Return Air Fan](/user-guide/2d-building/building/hvac/plant-hvac/air-handling-unit/return-air-fan.md)
- [Outside Air System](/user-guide/2d-building/building/hvac/plant-hvac/air-handling-unit/outside-air-system.md)
- [Heating Coil](/user-guide/2d-building/building/hvac/plant-hvac/air-handling-unit/heating-coil.md)
- [Cooling Coil](/user-guide/2d-building/building/hvac/plant-hvac/air-handling-unit/cooling-coil.md)
- [Chilled Water Loop](/user-guide/2d-building/building/hvac/plant-hvac/chilled-water-loop.md)
- [Chilled (Air Cooled)](/user-guide/2d-building/building/hvac/plant-hvac/chilled-water-loop/chilled-air-cooled.md)
- [Chiller (Water Cooled)](/user-guide/2d-building/building/hvac/plant-hvac/chilled-water-loop/chiller-water-cooled.md)
- [Four Pipe Heat Pump (Cooling)](/user-guide/2d-building/building/hvac/plant-hvac/chilled-water-loop/four-pipe-heat-pump-cooling.md)
- [Condenser Water Loop](/user-guide/2d-building/building/hvac/plant-hvac/condenser-water-loop.md)
- [Cooling Tower](/user-guide/2d-building/building/hvac/plant-hvac/condenser-water-loop/cooling-tower.md)
- [Auxiliary Condenser Water Loop - TBC](/user-guide/2d-building/building/hvac/plant-hvac/condenser-water-loop/auxiliary-condenser-water-loop-tbc.md)
- [Four Pipe Heat Pump](/user-guide/2d-building/building/hvac/plant-hvac/four-pipe-heat-pump.md)
- [Hot Water Loop](/user-guide/2d-building/building/hvac/plant-hvac/hot-water-loop.md)
- [Heating Device - Gas Boiler](/user-guide/2d-building/building/hvac/plant-hvac/hot-water-loop/heating-device-gas-boiler.md)
- [Heating Device – Air Source Heat Pump](/user-guide/2d-building/building/hvac/plant-hvac/hot-water-loop/heating-device-air-source-heat-pump.md)
- [Heating Device – Four Pipe Heat Pump (Heating)](/user-guide/2d-building/building/hvac/plant-hvac/hot-water-loop/heating-device-four-pipe-heat-pump-heating.md)
- [VRF Condenser Unit (Air Cooled)](/user-guide/2d-building/building/hvac/plant-hvac/vrf-condenser-unit-air-cooled.md)
- [Constant Air Volume System (Air Cooled)](/user-guide/2d-building/building/hvac/plant-hvac/constant-air-volume-system-air-cooled.md)
- [Fan Coil Unit System (Air Cooled)](/user-guide/2d-building/building/hvac/plant-hvac/fan-coil-unit-system-air-cooled.md)
- [Variable Air Volume System (Air Cooled)](/user-guide/2d-building/building/hvac/plant-hvac/variable-air-volume-system-air-cooled.md)
- [VRF Condenser Unit](/user-guide/2d-building/building/hvac/plant-hvac/vrf-condenser-unit.md)
- [Space HVAC](/user-guide/2d-building/building/hvac/space-hvac.md)
- [Air Terminal](/user-guide/2d-building/building/hvac/space-hvac/air-terminal.md)
- [Heating Coil](/user-guide/2d-building/building/hvac/space-hvac/air-terminal/heating-coil.md)
- [Fan Coil Unit](/user-guide/2d-building/building/hvac/space-hvac/fan-coil-unit.md)
- [Cooling Coil](/user-guide/2d-building/building/hvac/space-hvac/fan-coil-unit/cooling-coil.md)
- [Heating Coil](/user-guide/2d-building/building/hvac/space-hvac/fan-coil-unit/heating-coil.md)
- [Air Loop](/user-guide/2d-building/building/hvac/space-hvac/fan-coil-unit/air-loop.md)
- [Packaged Terminal Heat Pump (Split System)](/user-guide/2d-building/building/hvac/space-hvac/packaged-terminal-heat-pump-split-system.md)
- [Supply Air Fan](/user-guide/2d-building/building/hvac/space-hvac/packaged-terminal-heat-pump-split-system/supply-air-fan.md)
- [Heating Coil](/user-guide/2d-building/building/hvac/space-hvac/packaged-terminal-heat-pump-split-system/heating-coil.md)
- [Cooling Coil](/user-guide/2d-building/building/hvac/space-hvac/packaged-terminal-heat-pump-split-system/cooling-coil.md)
- [VRF Terminal Unit](/user-guide/2d-building/building/hvac/space-hvac/vrf-terminal-unit.md)
- [Air Loop](/user-guide/2d-building/building/hvac/space-hvac/vrf-terminal-unit/air-loop.md)
- [Water-to-Air Heat Pump](/user-guide/2d-building/building/hvac/space-hvac/water-to-air-heat-pump.md)
- [Constant Air Volume System (Air Cooled)](/user-guide/2d-building/building/hvac/space-hvac/constant-air-volume-system-air-cooled.md)
- [Fan Coil Unit](/user-guide/2d-building/building/hvac/space-hvac/fan-coil-unit-1.md)
- [Variable Air Volume System (Air Cooled)](/user-guide/2d-building/building/hvac/space-hvac/variable-air-volume-system-air-cooled.md)
- [Variable Refrigerant Flow](/user-guide/2d-building/building/hvac/space-hvac/variable-refrigerant-flow.md)
- [HVAC Templates](/user-guide/2d-building/building/hvac/hvac-templates.md)
- [Fan Coil Unit - Air Cooled (EnergyPlus HVACTemplate)](/user-guide/2d-building/building/hvac/hvac-templates/fan-coil-unit-air-cooled-energyplus-hvactemplate.md)
- [Packaged Variable Air Volume (EnergyPlus HVACTemplate)](/user-guide/2d-building/building/hvac/hvac-templates/packaged-variable-air-volume-energyplus-hvactemplate.md)
- [Packaged Constant Air Volume (EnergyPlus HVACTemplate)](/user-guide/2d-building/building/hvac/hvac-templates/packaged-constant-air-volume-energyplus-hvactemplate.md)
- [Variable Refrigerant Flow (EnergyPlus HVACTemplate)](/user-guide/2d-building/building/hvac/hvac-templates/variable-refrigerant-flow-energyplus-hvactemplate.md)
- [Central Plant and Air Handling System](/user-guide/2d-building/building/hvac/hvac-templates/central-plant-and-air-handling-system.md)
- [Packaged Air Handling Unit](/user-guide/2d-building/building/hvac/hvac-templates/packaged-air-handling-unit.md)
- [Fan Coil Unit System (Electric Heating)](/user-guide/2d-building/building/hvac/hvac-templates/fan-coil-unit-system-electric-heating.md)
- [Fan Coil Unit System (Water Heating)](/user-guide/2d-building/building/hvac/hvac-templates/fan-coil-unit-system-water-heating.md)
- [Four Pipe Heat Pump System](/user-guide/2d-building/building/hvac/hvac-templates/four-pipe-heat-pump-system.md)
- [Heat Recovery Ventilation](/user-guide/2d-building/building/hvac/hvac-templates/heat-recovery-ventilation.md)
- [Variable Refrigerant Flow](/user-guide/2d-building/building/hvac/hvac-templates/variable-refrigerant-flow.md)
- [Variable Refrigerant Flow (incl. Outside Air)](/user-guide/2d-building/building/hvac/hvac-templates/variable-refrigerant-flow-incl.-outside-air.md)
- [Water-cooled Package Unit](/user-guide/2d-building/building/hvac/hvac-templates/water-cooled-package-unit.md)
- [System No. 1 PTAC (Packaged Terminal Air Conditioner)](/user-guide/2d-building/building/hvac/hvac-templates/system-no.-1-ptac-packaged-terminal-air-conditioner.md)
- [System No. 2 PTHP (Packaged Terminal Heat Pump)](/user-guide/2d-building/building/hvac/hvac-templates/system-no.-2-pthp-packaged-terminal-heat-pump.md)
- [System No. 3 PSZ-AC (Packaged Rooftop Air Conditioner)](/user-guide/2d-building/building/hvac/hvac-templates/system-no.-3-psz-ac-packaged-rooftop-air-conditioner.md)
- [System No. 4 PSZ-HP (Packaged Rooftop Heat Pump)](/user-guide/2d-building/building/hvac/hvac-templates/system-no.-4-psz-hp-packaged-rooftop-heat-pump.md)
- [System No. 5 Packaged VAV with Reheat](/user-guide/2d-building/building/hvac/hvac-templates/system-no.-5-packaged-vav-with-reheat.md)
- [System No. 6 Packaged VAV with PFP Boxes](/user-guide/2d-building/building/hvac/hvac-templates/system-no.-6-packaged-vav-with-pfp-boxes.md)
- [System No. 7 VAV with Reheat](/user-guide/2d-building/building/hvac/hvac-templates/system-no.-7-vav-with-reheat.md)
- [System No. 8 VAV with PFP Boxes](/user-guide/2d-building/building/hvac/hvac-templates/system-no.-8-vav-with-pfp-boxes.md)
- [System No. 9 Heating (Furnace) and Ventilation](/user-guide/2d-building/building/hvac/hvac-templates/system-no.-9-heating-furnace-and-ventilation.md)
- [System No. 10 Heating (Electric) and Ventilation](/user-guide/2d-building/building/hvac/hvac-templates/system-no.-10-heating-electric-and-ventilation.md)
- [System No. 11 SZ-VAV (Single Zone VAV)](/user-guide/2d-building/building/hvac/hvac-templates/system-no.-11-sz-vav-single-zone-vav.md)
- [System No. 12 SZ-CV-HW (Single Zone CAV Hot Water)](/user-guide/2d-building/building/hvac/hvac-templates/system-no.-12-sz-cv-hw-single-zone-cav-hot-water.md)
- [System No. 13 SZ-CV-ER (Single Zone CAV Electric)](/user-guide/2d-building/building/hvac/hvac-templates/system-no.-13-sz-cv-er-single-zone-cav-electric.md)
- [System No. 1 VAV with Parallel Fan-Powered Boxes](/user-guide/2d-building/building/hvac/hvac-templates/system-no.-1-vav-with-parallel-fan-powered-boxes.md)
- [System No. 2 VAV with Reheat](/user-guide/2d-building/building/hvac/hvac-templates/system-no.-2-vav-with-reheat.md)
- [System No. 3 Packaged VAV with Parallel Fan-powered Boxes](/user-guide/2d-building/building/hvac/hvac-templates/system-no.-3-packaged-vav-with-parallel-fan-powered-boxes.md)
- [System No. 4 Packaged VAV with Reheat](/user-guide/2d-building/building/hvac/hvac-templates/system-no.-4-packaged-vav-with-reheat.md)
- [System No. 5 Two-pipe Fan Coil (N/A)](/user-guide/2d-building/building/hvac/hvac-templates/system-no.-5-two-pipe-fan-coil-n-a.md)
- [System No. 6 Water-source Heat Pump](/user-guide/2d-building/building/hvac/hvac-templates/system-no.-6-water-source-heat-pump.md)
- [System No. 7 Four-pipe Fan-coil](/user-guide/2d-building/building/hvac/hvac-templates/system-no.-7-four-pipe-fan-coil.md)
- [System No. 8 Packaged Terminal Heat Pump](/user-guide/2d-building/building/hvac/hvac-templates/system-no.-8-packaged-terminal-heat-pump.md)
- [System No. 9 Packaged Rooftop Heat Pump](/user-guide/2d-building/building/hvac/hvac-templates/system-no.-9-packaged-rooftop-heat-pump.md)
- [System No. 10 Packaged Terminal Air Conditioner](/user-guide/2d-building/building/hvac/hvac-templates/system-no.-10-packaged-terminal-air-conditioner.md)
- [System 11. Packaged Rooftop Air Conditioner](/user-guide/2d-building/building/hvac/hvac-templates/system-11.-packaged-rooftop-air-conditioner.md)
- [Shading](/user-guide/2d-building/building/shading.md)
- [Create Site Shading](/user-guide/2d-building/building/shading/create-site-shading.md)
- [Renewables](/user-guide/2d-building/building/renewables.md)
- [Manage Solar](/user-guide/2d-building/building/renewables/manage-solar.md)
- [Modelling](/user-guide/2d-building/building/modelling.md)
- [Simulation](/user-guide/2d-building/building/modelling/simulation.md)
- [Site](/user-guide/2d-building/building/modelling/site.md)
- [Calendar](/user-guide/2d-building/building/modelling/calendar.md)
- [Zones](/user-guide/2d-building/building/modelling/zones.md)
- [Reporting](/user-guide/2d-building/building/modelling/reporting.md)
- [Reference Building](/user-guide/2d-building/building/reference-building.md): This section is only applicable to workflows where a reference or notional building is set and related to minimum compliance.
- [J1V3](/user-guide/2d-building/building/reference-building/j1v3.md)
- [V 2.6.2.2](/user-guide/2d-building/building/reference-building/v-2.6.2.2.md)
- [H1 / VM1](/user-guide/2d-building/building/reference-building/h1-vm1.md)