AC (AC) split is used to air cooling in the room. The cooled room air will be streamed by the blower through a set of lower temperature evaporator pipes to produce cooler air. AC split cooling capacity varies it is 1/2 PK (5000 Btu / hour), 3/4 PK (7000 Btu / hour), 1 PK (9000 Btu / hour), 1 PK (9000 Btu / h), 1 ½ PK (12000 Btu / hour), 2 PK (18000 Btu / hr), and 2 ½ PK (24000 Btu / hr) which are usually listed on the factory label. The cooling capacity of the split AC is proportional to the blower air speed, the greater the speed at the blower the greater the cooling capacity of the split AC. It is therefore necessary. Supply calor of evaporator at each variation on speed. To calculate the evaporator heat supply at each air velocity variation can use simulation mode. The simulation mode is used to calculate the value of the heat supply with the evaporator disinot already created. The calculation of AC split machine evaporator LG 3/4 PK is done by using simulation mode. The purpose of the calculation is to determine the value of the heat supply evaporator (Qeva) on each variation of airspeed on the blower. There are 3 variations of air blower that is low speed, medium speed and high speed. The data required in the calculation is the process data in the form of air inlet on evaporator (Th, i), suction pressure and R-22 discharge, air velocity at the blower of each variation, geometry data and second fluid property properties. From the data then obtained the value of LMTDCF, F, hi, ho, Uo and Q. The analysis focused on the value of caloric calculation of the value of heat supply on the factory label. Based on calculation result with simulation mode, the value of evaporator heat supply at low speed 2301.01 Btu / hr, medium 2954.54 Btu / hr and high 3655,36 Btu / hr. From the results obtained prove that the greater the air velocity variation in the blower then the value of the evaporator heat supply increases. Of the three heat supply calculations of each air velocity variation nothing exceeds the heat supply value on the manufacturer's specification label.