car HVAC
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Does Car A/C or Heat Add CO₂ to the Cabin? A Real No-Occupant Test
Does running a gasoline car’s air conditioner or heater add CO₂ to the cabin? In our real no-occupant test, EVO-CO2V measured 420 ppm after…
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Where Does Fresh Air Enter a Car? A Real HVAC Intake Demonstration
Where does outside air actually enter a car? We used paper strips on a real vehicle to show the difference between recirculation and fresh-air…