Does idling with the heater on harm the car?

[LeNoah]

Idling with the heater on will slow down the engine's warming-up speed and increase fuel consumption, but it won't cause damage to the car. More information about idling is as follows: 1. According to relevant test data, using the heater while idling is related to the car's displacement and engine tuning. Of course, the main impacts of prolonged idling are increased fuel consumption and engine carbon buildup, so it's recommended not to leave the car idling for extended periods. 2. In idle mode, turning on the heater won't cause serious harm to the car, but it does affect passengers. However, since fuel doesn't burn completely during idling, carbon monoxide is produced. If windows remain closed, carbon monoxide concentration inside the cabin will gradually accumulate, potentially leading to carbon monoxide poisoning for occupants.