The objective of this study is to analyze the Characteristics of formaldehyde concentration according to the type of temperature control, to suggest the control methods to decrease formaldehyde emission in indoor conditions. This study was measured temperature, relative humidity(RH), formaldehyde that a single point in 50 household and plural point as time passes in 3 household. And control condition of a room, there are distinct the section of a artificial control and a self-regulating control. Formaldehyde was analyzed by HPLC. The results of this study are as follows; In the section of a artificial temperature control, formaldehyde concentration showed the crucial emission point which extremely increased formaldehyde concentration at $25^{circ}C$, that the absolutely independence temperature over $25^{circ}C$. And, in the section of a self-regulating temperature control, formaldehyde concentration have the crucial emission point at $25^{circ}C$ too, showed the independence on temperature at over $25^{circ}C$, selectively independence at less than $25^{circ}C$, and generally dependence on RH in the typical range 20-70% for ordinary life.