The renovation technique which uses Taiko-shoji and wooden pair glass sash for a window, filling an insulation material outside the mud wall layer can realize an improvement of indoor thermal environment of a traditional timber house at low installation cost. Combined use of a floor heating and an air-conditioner forms comfortable environment at low energy after the start of heating. In this paper, the simulations of the indoor thermal environment with these techniques were performed for the existing traditional timber house. In addition, annual heating and cooling loads were calculated and the results were compared with those of the traditional timber house for various insulation and heating conditions.
