TOYOTA 2011 Avalon - Manual (Page 247)

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3-1. Using the air conditioning system and defogger
3
Interior features
AVALON_U (OM41428U)
CAUTION
n 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 wind-
shield can cause the outer surface of the windshield to fog up, blocking your
vision.
NOTICE
n To prevent battery discharge
Do not leave the automatic air conditioning system on longer than necessary
when the engine is not running.