TOYOTA 2013 Prius PHV - Manual (Page 435)

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3-1. Using the air conditioning system and defogger
PRIUS PHV_OM_OM47787U_(U)
CAUTION
■ To prevent the windshield from fogging up
Do not use during cool air operation in extremely humid weather.
The difference between the temperature of the outside air and that of the
windshield can cause the outer surface of the windshield to fog up, blocking
your vision.
NOTICE
■ To prevent 12-volt battery discharge
Do not leave the air conditioning system on longer than necessary when the
hybrid system is not operating.