Condensation on the inside of windscreen and rear window

[Powell1975]

why do I get condensation on the inside of my car

[New Judge]

Because the air inside your car is warmer than that outside.

The cooler the air the less water vapour it can contain. When the warm air inside your car comes into contact with the cold windows, the temperature of the air drops. Water vapour must be released from the air as a result of this temperature drop. The vapour condenses (hence �condensation�) into liquid water which is deposited on the windows.

To avoid this happening you must either lower the temperature of the air inside or warm the windows up (there�s not much you can do about the outside air temperature). Air conditioning can achieve the former (and it also removes water vapour from the air inside as its temperature is lowered). Windscreen heaters can achieve the latter. Easier still (but a little less comfortable) is to open all the windows.

[Toureman]

Good advice from the new judge, some cars are prone to misting.

Make sure your car interior is not damp.

No need to have a cold car if you put the air con on just turn the heat up at the same time, the air con dehumidifies the air, this gets rid of condensation very quickly.

[Panic Button]

Probably a water leak.
Check under your mats to see if the carpet is damp.