Toyota 2008 Prius Quick Reference Manual page 235

CAUTION
n To prevent the windshield from fogging up
Do not use
difference between the temperature of the outside air and that of the wind-
shield can cause the outer surface of the windshield to fog up, blocking your
vision.
NOTICE
To prevent 12 volt battery discharge
n
Do not leave the automatic air conditioning system on longer than necessary
when the hybrid system is not running.
PRIUS_U_(L/O_0802)
3-2. Using the air conditioning system and defogger
during cool air operation in extremely humid weather. The
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