It is possible to design the thermal and humid indoor climate by using condensation phenomena on water ponds in a large well, if the relationship between the condensation rates and the boundary condition, i.e. air velocity, vapor pressure and adiabatic saturated temperature, was found from actual-sized experiments. In this report, such relationship was reinvestigated by using the reported experimental results. Conclusions were discussed as follows: 1) It is very difficult to measure surface temperature of water ponds when we used thermocouples. The reason is that there are many small waves on the water ponds. So simple calculation method for surface temperature of water ponds was proposed. When the proposed method can evaluate the surface temperature of water ponds by using water temperature and adiabatic saturated temperature. 2) Ratio of interior division was found from measurement results. This ratio coincided with the result from thermal conductance of saturated air film and of water film under the water surface. 3) When the ratio of interior division was used for estimating the water surface temperature, difference between vapor pressure of room air and of water surface can be easily obtained. That difference of vapor pressure can be used as the first approximation factor. And also each approximated function between vapor pressure and condensation (evaporation) rates was a straight line that coincides with the origin.