It is proposed to use a combined heating system for a city bus using heat extraction from the internal combustion engine and air curtains. The main components of the bus cabin heat balance equation are given, including heat required to heat the infiltrated air; heat losses that occur at service stops when passengers exit/enter; heat coming from the passengers and that which can be obtained from the engine, etc. It has been established that up to 4.1 kW of heat can be extracted from the heated surface of the exhaust manifold, and up to 3.5 kW from the surface of the exhaust tract – respectively, a total of up to 7.6 kW. Using ANSYS-Fluent, the operation of a combined heating system with air curtains above the doors and an additional fan for extracting heat from the internal combustion engine of the bus was simulated. The simulation was carried out at 2 operating modes of the heaters: 0.25m/s and 318 K; 0.5m/s and 323 K. Temperature fields were obtained for the left and right section, as well as for the middle of the bus cabin. It was found that the proposed heating system allows heating of the bus cabin quite within the regulatory limits, namely, it allows most parts of the cabin to reach a temperature of 291–295 K. This makes it possible not to install heaters under the seats, and also to reduce fuel consumption for the operation of the autonomous heater.