> For the complete documentation index, see [llms.txt](https://docs.betterbuilding.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.betterbuilding.io/user-guide/workflows/energy-efficiency.md).

# Energy Efficiency

- [Green Star Reference Building HVAC Systems](https://docs.betterbuilding.io/user-guide/workflows/energy-efficiency/green-star-reference-building-hvac-systems.md)
- [Package/Split DX reverse cycle (heat pump) systems](https://docs.betterbuilding.io/user-guide/workflows/energy-efficiency/green-star-reference-building-hvac-systems/package-split-dx-reverse-cycle-heat-pump-systems.md)
- [Air-cooled chillers](https://docs.betterbuilding.io/user-guide/workflows/energy-efficiency/green-star-reference-building-hvac-systems/air-cooled-chillers.md)
- [Water-cooled chillers](https://docs.betterbuilding.io/user-guide/workflows/energy-efficiency/green-star-reference-building-hvac-systems/water-cooled-chillers.md)
- [Package reverse cycle (heat pump) systems](https://docs.betterbuilding.io/user-guide/workflows/energy-efficiency/green-star-reference-building-hvac-systems/package-reverse-cycle-heat-pump-systems.md)
- [ASHRAE 90.1 2019](https://docs.betterbuilding.io/user-guide/workflows/energy-efficiency/ashrae-90.1-2019.md)
- [ASHRAE 90.1 Appendix G 2019 PRM](https://docs.betterbuilding.io/user-guide/workflows/energy-efficiency/ashrae-90.1-2019/ashrae-90.1-appendix-g-2019-prm.md)
- [ASHRAE 90.1-2019 Appendix G Baseline Model](https://docs.betterbuilding.io/user-guide/workflows/energy-efficiency/ashrae-90.1-2019/ashrae-90.1-appendix-g-2019-prm/ashrae-90.1-2019-appendix-g-baseline-model.md)
- [ASHRAE 90.1 Appendix G 2019 Proposed And Baseline Building Performance](https://docs.betterbuilding.io/user-guide/workflows/energy-efficiency/ashrae-90.1-2019/ashrae-90.1-appendix-g-2019-proposed-and-baseline-building-performance.md)
- [Baseline Service Water-Heating Systems](https://docs.betterbuilding.io/user-guide/workflows/energy-efficiency/ashrae-90.1-2019/ashrae-90.1-appendix-g-2019-proposed-and-baseline-building-performance/baseline-service-water-heating-systems.md)
- [ASHRAE 90.1 Appendix G 2019 Inputs](https://docs.betterbuilding.io/user-guide/workflows/energy-efficiency/ashrae-90.1-2019/ashrae-90.1-appendix-g-2019-inputs.md)
- [ASHRAE 90.1 Appendix G 2019 Outputs](https://docs.betterbuilding.io/user-guide/workflows/energy-efficiency/ashrae-90.1-2019/ashrae-90.1-appendix-g-2019-outputs.md)
- [ASHRAE 90.1 Economic Tariff Structures](https://docs.betterbuilding.io/user-guide/workflows/energy-efficiency/ashrae-90.1-2019/ashrae-90.1-economic-tariff-structures.md)
- [ASHRAE 90.1 Appendix G 2019 - Understanding the Performance Cost Index (PCI)](https://docs.betterbuilding.io/user-guide/workflows/energy-efficiency/ashrae-90.1-2019/ashrae-90.1-appendix-g-2019-understanding-the-performance-cost-index-pci.md)
- [ASHRAE 90.1 Appendix G 2019 PRM Example with Hypothetical Data](https://docs.betterbuilding.io/user-guide/workflows/energy-efficiency/ashrae-90.1-2019/ashrae-90.1-appendix-g-2019-prm-example-with-hypothetical-data.md)
- [ASHRAE 90.1 Appendix G 2019 Baseline HVAC Systems](https://docs.betterbuilding.io/user-guide/workflows/energy-efficiency/ashrae-90.1-2019/ashrae-90.1-appendix-g-2019-baseline-hvac-systems.md)
- [ASHRAE Standard 90.1-2019 Energy Cost Budget (ECB) Method](https://docs.betterbuilding.io/user-guide/workflows/energy-efficiency/ashrae-90.1-2019/ashrae-standard-90.1-2019-energy-cost-budget-ecb-method.md)
- [Energy Cost Budget Method](https://docs.betterbuilding.io/user-guide/workflows/energy-efficiency/ashrae-90.1-2019/energy-cost-budget-method.md)
- [Budget HVAC System Types 1-11](https://docs.betterbuilding.io/user-guide/workflows/energy-efficiency/ashrae-90.1-2019/energy-cost-budget-method/budget-hvac-system-types-1-11.md)
- [Appendix C - Methodology for Building Envelope Trade-Off Option](https://docs.betterbuilding.io/user-guide/workflows/energy-efficiency/ashrae-90.1-2019/appendix-c-methodology-for-building-envelope-trade-off-option.md)
- [Proposed Envelope Performance Factor Calculation](https://docs.betterbuilding.io/user-guide/workflows/energy-efficiency/ashrae-90.1-2019/appendix-c-methodology-for-building-envelope-trade-off-option/proposed-envelope-performance-factor-calculation.md)
- [Base Envelope Performance Factor Calculation](https://docs.betterbuilding.io/user-guide/workflows/energy-efficiency/ashrae-90.1-2019/appendix-c-methodology-for-building-envelope-trade-off-option/base-envelope-performance-factor-calculation.md)
- [Prescriptive Building Envelope Compliance Path](https://docs.betterbuilding.io/user-guide/workflows/energy-efficiency/ashrae-90.1-2019/appendix-c-methodology-for-building-envelope-trade-off-option/prescriptive-building-envelope-compliance-path.md)
- [H1/AS1](https://docs.betterbuilding.io/user-guide/workflows/energy-efficiency/h1-as1.md)
- [H1/AS2](https://docs.betterbuilding.io/user-guide/workflows/energy-efficiency/h1-as2.md)
- [Part J4 Building Fabric](https://docs.betterbuilding.io/user-guide/workflows/energy-efficiency/part-j4-building-fabric.md)
- [Part J4 Info](https://docs.betterbuilding.io/user-guide/workflows/energy-efficiency/part-j4-building-fabric/part-j4-info.md)
- [J4D3 Thermal construction — general](https://docs.betterbuilding.io/user-guide/workflows/energy-efficiency/part-j4-building-fabric/part-j4-info/j4d3-thermal-construction-general.md)
- [J4D4 Roof and Ceiling Construction](https://docs.betterbuilding.io/user-guide/workflows/energy-efficiency/part-j4-building-fabric/part-j4-info/j4d4-roof-and-ceiling-construction.md)
- [J4D5 Roof Lights](https://docs.betterbuilding.io/user-guide/workflows/energy-efficiency/part-j4-building-fabric/part-j4-info/j4d5-roof-lights.md)
- [J4D6 Walls and glazing](https://docs.betterbuilding.io/user-guide/workflows/energy-efficiency/part-j4-building-fabric/part-j4-info/j4d6-walls-and-glazing.md)
- [NCC 2019 Façade Calculator and Better Building](https://docs.betterbuilding.io/user-guide/workflows/energy-efficiency/part-j4-building-fabric/part-j4-info/j4d6-walls-and-glazing/ncc-2019-facade-calculator-and-better-building.md)
- [Specification 37](https://docs.betterbuilding.io/user-guide/workflows/energy-efficiency/part-j4-building-fabric/part-j4-info/j4d6-walls-and-glazing/specification-37.md)
- [J4D7 Floors](https://docs.betterbuilding.io/user-guide/workflows/energy-efficiency/part-j4-building-fabric/part-j4-info/j4d7-floors.md)
- [J1V3 Verification using a reference building](https://docs.betterbuilding.io/user-guide/workflows/energy-efficiency/j1v3-verification-using-a-reference-building.md)
- [Specification 44](https://docs.betterbuilding.io/user-guide/workflows/energy-efficiency/specification-44.md)
- [H6P1 Thermal performance](https://docs.betterbuilding.io/user-guide/workflows/energy-efficiency/specification-44/h6p1-thermal-performance.md)
- [H6P2  Energy usage](https://docs.betterbuilding.io/user-guide/workflows/energy-efficiency/specification-44/h6p2-energy-usage.md)
- [H6V2 Verification using reference building](https://docs.betterbuilding.io/user-guide/workflows/energy-efficiency/specification-44/h6v2-verification-using-reference-building.md)
- [Appliances](https://docs.betterbuilding.io/user-guide/workflows/energy-efficiency/specification-44/appliances.md)
- [Creating a Specification 44 Report](https://docs.betterbuilding.io/user-guide/workflows/energy-efficiency/specification-44/creating-a-specification-44-report.md)
- [J1V5 Verification using a reference building for a Class 2 sole-occupancy unit](https://docs.betterbuilding.io/user-guide/workflows/energy-efficiency/j1v5-verification-using-a-reference-building-for-a-class-2-sole-occupancy-unit.md)
- [J1P2 Performance Requirements](https://docs.betterbuilding.io/user-guide/workflows/energy-efficiency/j1v5-verification-using-a-reference-building-for-a-class-2-sole-occupancy-unit/j1p2-performance-requirements.md)
- [J1P3 Performance Requirements](https://docs.betterbuilding.io/user-guide/workflows/energy-efficiency/j1v5-verification-using-a-reference-building-for-a-class-2-sole-occupancy-unit/j1p3-performance-requirements.md)
- [J1V5 HVAC Schedules](https://docs.betterbuilding.io/user-guide/workflows/energy-efficiency/j1v5-verification-using-a-reference-building-for-a-class-2-sole-occupancy-unit/j1v5-hvac-schedules.md)
- [J1V5 Lighting Schedules](https://docs.betterbuilding.io/user-guide/workflows/energy-efficiency/j1v5-verification-using-a-reference-building-for-a-class-2-sole-occupancy-unit/j1v5-lighting-schedules.md)
- [J1V5 Occupancy Schedules](https://docs.betterbuilding.io/user-guide/workflows/energy-efficiency/j1v5-verification-using-a-reference-building-for-a-class-2-sole-occupancy-unit/j1v5-occupancy-schedules.md)
- [J1V5 Cooking and Appliance Schedules](https://docs.betterbuilding.io/user-guide/workflows/energy-efficiency/j1v5-verification-using-a-reference-building-for-a-class-2-sole-occupancy-unit/j1v5-cooking-and-appliance-schedules.md)
- [J1V5 Internal Heat Loads](https://docs.betterbuilding.io/user-guide/workflows/energy-efficiency/j1v5-verification-using-a-reference-building-for-a-class-2-sole-occupancy-unit/j1v5-internal-heat-loads.md)
- [J1V5 Air-conditioning Setpoints](https://docs.betterbuilding.io/user-guide/workflows/energy-efficiency/j1v5-verification-using-a-reference-building-for-a-class-2-sole-occupancy-unit/j1v5-air-conditioning-setpoints.md)
- [J1V5 Natural Ventilation Requirements](https://docs.betterbuilding.io/user-guide/workflows/energy-efficiency/j1v5-verification-using-a-reference-building-for-a-class-2-sole-occupancy-unit/j1v5-natural-ventilation-requirements.md)
- [V2.6.2.2 Verification using a reference building](https://docs.betterbuilding.io/user-guide/workflows/energy-efficiency/v2.6.2.2-verification-using-a-reference-building.md)
- [V2.6.2.2 Method](https://docs.betterbuilding.io/user-guide/workflows/energy-efficiency/v2.6.2.2-verification-using-a-reference-building/v2.6.2.2-method.md)
- [Support Materials](https://docs.betterbuilding.io/user-guide/workflows/energy-efficiency/v2.6.2.2-verification-using-a-reference-building/support-materials.md)
- [Total R-values](https://docs.betterbuilding.io/user-guide/workflows/energy-efficiency/total-r-values.md)
- [Advanced HVAC](https://docs.betterbuilding.io/user-guide/workflows/energy-efficiency/advanced-hvac.md)
- [Zone Control Thermostat](https://docs.betterbuilding.io/user-guide/workflows/energy-efficiency/advanced-hvac/zone-control-thermostat.md)
- [EnergyPlus Sizing Calculations](https://docs.betterbuilding.io/user-guide/workflows/energy-efficiency/advanced-hvac/energyplus-sizing-calculations.md)
- [Demand-controlled ventilation](https://docs.betterbuilding.io/user-guide/workflows/energy-efficiency/advanced-hvac/demand-controlled-ventilation.md)
- [Outdoor air reset-based controls](https://docs.betterbuilding.io/user-guide/workflows/energy-efficiency/advanced-hvac/outdoor-air-reset-based-controls.md)
- [Modelling four-pipe heat pumps](https://docs.betterbuilding.io/user-guide/workflows/energy-efficiency/advanced-hvac/modelling-four-pipe-heat-pumps.md)
- [Modelling a fixed minimum air flow rate on AHUs/VAVs](https://docs.betterbuilding.io/user-guide/workflows/energy-efficiency/advanced-hvac/modelling-a-fixed-minimum-air-flow-rate-on-ahus-vavs.md)
- [Customise fan performance curves](https://docs.betterbuilding.io/user-guide/workflows/energy-efficiency/advanced-hvac/customise-fan-performance-curves.md)
- [Customise chiller performance curves](https://docs.betterbuilding.io/user-guide/workflows/energy-efficiency/advanced-hvac/customise-chiller-performance-curves.md)
- [Design Day Weather Overview](https://docs.betterbuilding.io/user-guide/workflows/energy-efficiency/advanced-hvac/design-day-weather-overview.md)
- [Modelling air source heat pumps](https://docs.betterbuilding.io/user-guide/workflows/energy-efficiency/advanced-hvac/modelling-air-source-heat-pumps.md)
- [Green Star: Reference HVAC System Type 3](https://docs.betterbuilding.io/user-guide/workflows/energy-efficiency/advanced-hvac/green-star-reference-hvac-system-type-3.md)
- [Advanced HVAC: Typical VAV System](https://docs.betterbuilding.io/user-guide/workflows/energy-efficiency/advanced-hvac/advanced-hvac-typical-vav-system.md)
- [Design Day Weather Overview](https://docs.betterbuilding.io/user-guide/workflows/energy-efficiency/advanced-hvac/design-day-weather-overview-1.md)
- [Energy and Thermal FAQ's](https://docs.betterbuilding.io/user-guide/workflows/energy-efficiency/energy-and-thermal-faqs.md)
- [Thermal Comfort - PMV](https://docs.betterbuilding.io/user-guide/workflows/energy-efficiency/energy-and-thermal-faqs/thermal-comfort-pmv.md)
- [Thermal Comfort - CBE Model](https://docs.betterbuilding.io/user-guide/workflows/energy-efficiency/energy-and-thermal-faqs/thermal-comfort-cbe-model.md)
- [Total R-value](https://docs.betterbuilding.io/user-guide/workflows/energy-efficiency/energy-and-thermal-faqs/total-r-value.md)
- [Solar Control](https://docs.betterbuilding.io/user-guide/workflows/energy-efficiency/energy-and-thermal-faqs/solar-control.md)
- [VRF Modeling in EnergyPlus](https://docs.betterbuilding.io/user-guide/workflows/energy-efficiency/energy-and-thermal-faqs/vrf-modeling-in-energyplus.md)
- [Thermal Bridging - The Basics](https://docs.betterbuilding.io/user-guide/workflows/energy-efficiency/energy-and-thermal-faqs/thermal-bridging-the-basics.md)
- [Colour](https://docs.betterbuilding.io/user-guide/workflows/energy-efficiency/energy-and-thermal-faqs/colour.md)


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