Some rules of thumb to reduce energy use are:Program similar spaces together to reduce distribution losses Use a window-to-wall ratio below 40%, on averageUse a window-to-wall ratio below 20% on east and west sides, to reduce low-angle solar gain, an

Some rules of thumb to reduce energy use are:

• Program similar spaces together to reduce distribution losses 
• Use a window-to-wall ratio below 40%, on average
• Use a window-to-wall ratio below 20% on east and west sides, to reduce low-angle solar gain, and glare; 
• Reduce direct solar gain with solar shades or building geometry and orientation
• Distribute heating and cooling loads uniformly throughout all facades for a smaller system size. 
• Design a tight and well-insulated building envelope to reduce the heating load and improve HVAC performance
• Use right-sized and efficient heating and cooling systems
• Consider onsite renewable energy generation.