The main objective of this contribution is to identify the dominant source and the principle reason for high energy consumption. The most reliable method is to provide a consistent assessment of energy consumptions of a farm studio under Saharan weather conditions. Our approach was based on a new model for the prediction of energy requirements; the production of domestic hot water, free (except for solar gains) and internal loads related to lighting, occupants and equipments are fully considered. Economic-financial aspects are assessed according to the electric bill adopted by the Algerian state; annual and monthly energy needs will be evaluated by kilowatt-hours (kWh) and then converted in Algerian Dinars (DZD) or Euros (sic). As a result, the net electric energy bill required to maintain comfort in all areas at a temperature of T-comf amounts to 144171.59 DZD/year. The building envelope is the main source of energy loss. According to the technico-economic study, the external integration of an insulating material (thickness of 6 cm) in facades and roofs can provide a decrease of 56.05% of the energy loads. Priority will be given to active concepts to reduce energy demand: A grid-connected PV system feed directly the electrical network and the surplus of energy injected into the national grid network It is appropriate to consider solar thermal collectors (C) 2017 Elsevier B.V. All rights reserved.