Warm air and cold air work differently. Cold air is formed by pressurizing the compressor to liquefy the refrigerant and then vaporizing it to absorb a lot of heat in the air. When the cold air is turned on, the compressor pulley drives the compressor to work, which increases the engine load and consumes a certain amount of fuel.
Warm air comes from the heat generated when the engine is working: when the cooling system of the engine radiates heat to the engine, the radiated heat is sent into the car through the fan to form warm air; When the warm air is not used, the fan stops running, the hot air port is closed, and the heat emitted will be completely dissipated into the atmosphere.
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The AC key is the switch of the air conditioner compressor. To use air conditioning in summer, you must turn on the AC button, that is, turn on the air conditioning; The warm air only uses the thermal cycle in the car, and there is no need to start the air conditioning compressor at all. So you just need to adjust the air conditioning button, and you can turn on the heater without turning on the AC switch.
In the cold season, we need to raise the temperature inside the car quickly. When the car starts, the engine starts to warm up. After the engine temperature indicator reaches the middle position, first turn on the warm air conditioner, and set the air circulation to external circulation, so that the cold air in the car can be discharged outside the car. After waiting for 2 to 3 minutes, set the air circulation to internal circulation.
When it comes to rain and snow and the temperature difference between the inside and outside of the car is relatively large, the front windshield is prone to fog. At this time, we only need to adjust the direction of the warm air to the position where it blows to the front windshield, and the fog can be removed in a few minutes.
Will warm air really increase fuel consumption in winter? -Popular Science China-People's Network