A variety of factors will determine the energy demand. The energy usage will be very different if the building is used as an office rather than a home. The type of appliances required will differ for each scenario, as well as the hours of usage for each day. The number of people will determine how much energy is required. People all have different wants and expectations for the environment they live in.
Some people like to live in a very cool home while others like it very warm.
Some people are willing to wash their dishes by hand while others like using a dish washer. Some people like a well lit living space while others prefer a higher amount of natural light. They behavior of the people using the space will, to a great degree, drive the energy design of the structure. Financial Resources - Financial resources play a large role in determining what is available for the final design. A budget should be created to determine how much money is available for the necessary equipment and materials.