Abstract: The invention includes a step of supplying at least one heat control means of heating means and cooling means for conditioning the air temperature, and a step of manufacturing a fan for blowing air controlled by the heat control means, in which the step of manufacturing the fan includes a step of preparing a compound material having (i) glass fiber, and (ii) at least one copolymer of a copolymer produced from a monomer containing acrylonitrile and styrene, and a copolymer produced from styrene and a heat resistant monomer, a step of forming a molded part by molding the compound material, a step of assembling a fan by using the molded part, and a step of clearing the molded part of strain by annealing the fan by hot air circulation in a temperature range lower by about 5° C. to about 20° C. than the load deflection temperature, and in a wind velocity range of about 1 m/sec to about 3 m/sec. The fan having a load deflection temperature of about 100° C.