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The heavy-duty truck industry has adopted various methods and technologies to provide comfort in sleeper cabins during rest periods. For heating a sleeper cabin the fuel-operated heating technology has been used already industry wide, due to performance, ecological, and economical reasons. The same criteria apply to the comfort requirements in the summer or in warmer climate. One of the most common methods is still the idling of the main truck engine. While engine idling increases both fuel consumption and emissions, it is also having a negative effect on the engine and exhaust system maintenance, especially with the latest changes of the emission regulation and the application of active and passive Diesel Particulate Filter (DPF) regeneration strategies.