Combined with the cold region climate characteristics and the current situation of temperature control in heating room, the relationship between the natural cold source utilization rate and variable frequency energy saving of heat exchanger itself which working fluid was 50% concentration glycol solution was experimentally studied. The results showed that with the parameter of power model, it was feasible for the variable frequency energy saved of heat exchanger itself, under the satisfied conditions of difference in temperature of inside and outside, pump and fan operating frequency, heat exchanger power at the same time. The variable frequency energy saved effect of ethylene glycol heat exchanger was proved in terms of the analysis of climate data, palisade structure heat exchanger and center temperature control test in Harbin.