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I'm not "in the business", but I do have a state HVAC Engineer's license, and I keep a small back-stem dial thermometer in the center vent of all of my vehicles. I only have the standard HAVC system in my FRS.
On a 90F summer with the A/C on, I can modulate the air temp from the vent anywhere between about 42F to about 85F.
On a 30 F winter day with the heat on, I can modulate the air temp from the vent from about 40F to 80F.
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