Yes, using the AC in a car can reduce its power and fuel efficiency. The AC compressor is driven by the engine through a belt, and when the AC is turned on, it places an additional load on the engine, causing it to work harder and use more fuel.
Yes, the AC system in a car does require power from the engine to operate, which can lead to a slight reduction in power and fuel efficiency. The AC compressor is driven by a belt connected to the engine, which places an additional load on the engine and can reduce the amount of power available to accelerate or climb hills.