Dehumidified Defrost needed?

Is Lewiston all that humid? Up in the "N end" we have days of rain, slushy snow, etc, of high humidity, were if not dehumidified, you at least need outside ventilation. We got by most of my life without. I don't know when the first was I had, perhaps my 97 Olds Cutlass? Nothing before that had it. Nothing in the 70's that I know of.

Lewiston isn’t bad but my place is on top of the grade and the car will be driven all over the northwest.
Good to know it hasn’t always been a mainstay feature! I will do some more research.

Check with the larger aftermarket AC suppliers and tell them what you are doing, as well as your average weather conditions to see what they recommend. I know that here in south Texas, AC is almost a must have accessory because of the humidity.

Oh yeah we hit 100-110* often in the summer, I’m not worried about those days, it’s those cool spring/fall mornings that are 35* that we may have issues with.

If I can find a bypass valve or diverted valve to redirect my heat function to the defrost vents I’ll likely attempt to run that first with the coldmaster setup. Can’t find anything so far but likely looking with the wrong search terms.

Mike