A single family house is planned in Sweden with the objective of integrating renewable energies in the heating design. The house is provided with the solar floor and DHW (domestic hot water) heating system with flat plate solar collector. TRNSYS programme is used to simulate the houses (well insulated house and not well insulated house); dynamic simulations are used to confirm the technical feasibility of the studied concept, and to check the utilization of solar power and auxiliary energy. A differential parameter sensitivity analysis is made in an attempt to account for uncertainties in some input parameters like insulation thickness, collector area. It seems that no major improvement in the results expect to say the well insulated house performs well i.e. low heat losses due to good thermal insulation after comparing the results for both the houses. Further in the work annual simulations are performed to the system with possible improvements to achieve desired objective.