TAP system, a kind of natural convective space heating collector, has a good heat loss by night. The aim of this paper is to induce and to study an hourly heat flow theory by response factors analysis with TAP in inside and outside insulated construction, to compare and evaluate on thermal performance an hourly natural temperature, heated room temperature and heating load in aboved-mention constructions with computer simulation. The results of the study can be summarized as follows. According that there is no TAP and with TAP, it is inside insulated construction and outside insulated construction, daily natural range of temperature each shows $12.5^{circ}C$ and $16.7^{circ}C$, $2.7^{circ}C$ and $3.7^{circ}C$, daily heated range of temperature with noramal control heating system each shows $6.6^{circ}C$ and $12.1^{circ}C$, $1.7^{circ}C$ and $3.1^{circ}C$, heating hours each show 10 hr and 7 hr, 9 hr and 4 hr and heating energy saving percentage in january 123% and 79%, 100% and 40%. Therefore, energy saving percentage shows that outside insulated construction saves about 54% in comparision with inside insulated construction.