To discuss the energy saving effects of heat-reflective insulation coating on exterior envelope walls in the hot summer and cold winter zone, the experimental apparatus and the actual test rooms are built respectively, the heat flux data of east, south and west walls are analyzed by monitoring the wall temperature changes of two test rooms with and without the heat reflective insulation coating in Hangzhou in summer and winter. The experimental results indicate that the heat reflective insulation coating could reduce the exterior wall surface temperature effectively, and the maximum temperature change is about 8-10 degrees C. By calculating, it was found that the annual air-conditioning electricity saving with heat reflective insulation coating on exterior walls is about 5.8 kWh/(m(2) month), which shows that the energy saving effect of the heat insulation coating on the exterior wall is obvious in Hangzhou. (c) 2012 Elsevier BM. All rights reserved.