So I just got a heated attached garage added to my house, and it is lovely on those -30º days (we’ve had a couple already this winter, though it hasn’t hit -40º yet) to climb into a already warm car for the drive to work. The only problem is when I get to the other end, where I then have to park the car outside all day at work. When I come out after work, the insides of the windows are all completely frosted over, to an extent that the back window rarely defrosts before I get home (about a 15 minute drive). Annoying at best, potentially dangerous at worst, unless I waste a lot of gas just letting the car idle until the windows defrost. Scraping, while quite effective on outside window frost, doesn’t work well on the insides.
What can I do to prevent this? I tried turning on my defroster full for the drive to work, but that didn’t seem to help much - I think my car puts it on internal circulation when on full defrost, thereby keeping all the most warm air inside.