When funning your heater, make sure that the air vent is switched to outside air coming in and not on recirculate( RECIRC).
(RECIRC) will spread around all of your body humidity.
FROM GOOGLE:
People also ask
Should I keep my car AC or HEAT on recirculate?
Recirculation makes your cars a/c significantly more effective and efficient when cooling, but when heating increases humidity often causing the windows to fog up. It is recommended to never use recirculation below 66F (19C) as it will not remove enough humidity to keep windows from fogging.
(RECIRC) will spread around all of your body humidity.
FROM GOOGLE:
People also ask
Should I keep my car AC or HEAT on recirculate?
Recirculation makes your cars a/c significantly more effective and efficient when cooling, but when heating increases humidity often causing the windows to fog up. It is recommended to never use recirculation below 66F (19C) as it will not remove enough humidity to keep windows from fogging.