In the winter heating period, the forced power output of cogeneration units is at a high level to meet heating demand. This leads to the limited peak regulation capacity of units. To improve the peak regulation ability of the cogeneration system and promote the absorption of renewable energy, the meteorological factors affecting the thermal comfort level are considered, and an operational strategy of exploiting the elasticity of the thermal load side is formulated. First, the operating characteristic model of thermal energy supply equipment is established. In the load side, the thermal load model considering thermal comfort is established by introducing the outdoor meteorological temperature. Then, aiming at minimizing total coal consumption and maximizing photovoltaic consumption, a combined optimization scheduling model considering thermal comfort elasticity is established. Its effectiveness is verified by simulation. The results show that by reducing the thermal comfort level within the elastic range of the user's thermal comfort level, flexible Internet space can be provided for the peak stage of photovoltaic output. This can effectively improve the consumption level of photovoltaic power generation and reduce the fuel cost. However, when combined with high efficiency heat source equipment, the effect of heat load regulation considering the comprehensive outdoor meteorological temperature on peak reduction is not obvious. This work is supported by the Key Research and Development Program of Shandong Province (No. 2019GGX103045).