fresh air mode
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Fresh-Air Mode vs Open Windows: Which Lowers Car CO₂ Faster? A Real Test
Which lowers high car cabin CO₂ faster: fresh-air HVAC or opening the windows? In our real EVO-CO2V test, both methods reduced CO₂ from above…
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When Should You Switch from Recirculation to Fresh Air in a Hot Car? A Real CO₂ Test
In a real sun-heated vehicle test, we ventilated the cabin, used A/C recirculation for rapid cooling, and measured 1,034 ppm CO₂ with EVO-CO2V before…
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Does Lexus AUTO Air Intake Switch to Fresh Air at High CO₂? Our Real Test
Many vehicles offer an automatic air-intake mode that can switch between recirculated cabin air and outside air. But what happens when cabin CO₂ becomes…
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Does Automatic Car Climate Control Switch to Fresh Air When CO₂ Rises? Our Real Test
Our team monitored cabin CO₂ while the vehicle climate system was operating in automatic mode. During the recorded sequence, CO₂ rose from about 2,980…
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We Used Recirculation to Avoid a Truck Odor—Then Cabin CO₂ Rose to 1,573 ppm
We temporarily switched to recirculation while passing a strong-smelling truck. After we forgot to switch back, cabin CO₂ rose to about 1,573 ppm, then…
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Does Fan Speed Affect Car CO₂ in Fresh-Air Mode? Our 4-Person Test
Our team tested four people in the same car with fresh-air ventilation. At fan level 1, CO₂ rose from about 524 to 866 ppm…
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How Different Is CO₂ Inside and Outside a Car? Our Real 1,500 vs 450 ppm Test
Our team measured about 1,500 ppm CO₂ inside a car and about 450 ppm in the outside air beside the same vehicle, a difference…
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Does Recirculation Save EV Energy? What We Measured on the Same 20.8 km Route
We drove the same 20.8 km EV route twice with the HVAC at 28°C and fan level 5. The vehicle displayed 11.3 kWh/100 km…
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When Should I Switch From Recirculation to Fresh Air? What I Learned From My Own Car CO₂ Test
I tested my car’s recirculation and fresh-air modes while watching cabin CO₂ in real time. The results changed how I personally use the ventilation…