Make sure it is not on recirculate. And if you bring snow in with yor feet this makes it worse. How many people in the car?

The AC will run when the defrost is on unless it has been disabled. But it doesn't run a lot when it is really cold out. Still it does and this helps when there is moisture in the car to dry it out.

I suppose there is the chance the AC drain hose is froze or blocked shut.

 

Newer cars are so well sealed its hard to get rid of moisture; a/c tries like raspberry is saying.
I actually remove my driver side rubber matts and dump/dry them out once a week, seems to help.
Larger glass area in some cars seems to make it worse for some reason.

 

Do you park in a heated parking area? Use the Defrost button to clear your windshield. That works amazingly fast.

 

When using HVAC,, run the A/C to help "condition" the air before it makes it into remainder of the HVAC system and ducts..

Std flow is inlet to fan, all air pass through A/C evaporator first, then carry on into remainder of HVAC, either around heat core, or through heat core, depending on door angle (temp setting)..

 

Do you have the carpet mats? When I switched to winter (rubber mats) the frost inside the vehicle when away. For us the carpet mats were just holding too much water.

 

It might also help to clean the glass thoroughly. I've noticed frost does not build up (if at all) on a really clean windshield compared to one that is even just moderately dirty.

 

Mine has been icing up also. I think the vehicle is too well sealed and the air inside is trapped...no leakage. My mats are Weathertechs and it's **** cold here these days.

 

I have the same issue, but it is fog that builds up. My Santa Fe and the '12 Tucson did it. Recirc is off. No moisture brought into the vehicle. Only myself in it. I can use defrost to take it off the window, but it will make it's way back onto the windshield after about 10 minutes. I've been around 'newer' cars, but Hyundai is the only one to do this. Very peculiar indeed for ice and fogging to happen so easily.

 

I have the same issue, but it is fog that builds up.

Only myself in it. I can use defrost to take it off the window, but it will make it's way back onto the windshield after about 10 minutes.

I have had similar instances. I turn on the A/C and the defrost to rid myself of it. Done.

There have been instances where it has come back after a period of time, but not always. It can be annoying, as you alluded to. I have had this occur in a Honda CRX, also. Just did the above steps, learned to accept that it sometimes happens, and moved on.

Not the answer you were seeking, but the only one I can offer.

 

If it's humid out you will have to keep the defrost going. If it's not so humid try turning the fan speed up and if it gets too hot tun the temperature down. If the windshield is dirty if builds up water faster as well if there are a couple of people in the car. lot of ifs....