1. Attachments are working again! Check out this thread for more details and to report any other bugs.

Air conditioner and ambient temperature?

Discussion in 'Gen 3 Prius Fuel Economy' started by syncmacd, Sep 16, 2009.

  1. syncmacd

    syncmacd Waxing is Relaxing

    Joined:
    Apr 30, 2009
    80
    15
    1
    Location:
    SoCal
    Vehicle:
    2010 Prius
    Model:
    II
    In California the temperature is often low in the morning (upper 60's) but with the sun and the windows closed the car can heat up quickly. Is it better for the gas mileage to turn the air conditioner temperature to match the temperature of the outside? Or should we just leave the temperature at 78 degrees?
     
  2. a64pilot

    a64pilot Active Member

    Joined:
    Aug 3, 2008
    771
    62
    0
    Location:
    Albany Ga.
    Vehicle:
    2010 Prius
    Model:
    III
    In the morning, I put it on vent, fresh air mode with the AC off, but that is while it's still dark. I would say do whatever is required to stay comfortable, The AC does dehumidify if you need that. I believe the traction battery doesn't like heat, so I keep the car cool in the hope that it is helping to cool the battery. Yes there will be some MPG hit from running the AC, size of the hit is based on how hard it works of course, from what you describe, I would think the loss would be minimal.
     
    1 person likes this.
  3. Bobsprius

    Bobsprius BobPrius

    Joined:
    Jul 23, 2009
    679
    80
    0
    Location:
    Buffalo
    Vehicle:
    2010 Prius
    Model:
    V
    I would try turning down the temp to LO and using VENT to see if that makes you comfortable enough. If so, then you found the match. If I recall from when living out in CA for 11 years, the mornings could be cool, and with the tpical low humidity you should not need the A/C. By the time you leave work I would think sure, it's safe to go an use it. The draw on this A/C unit is not as severe to some other non-hybrid vehicles. And in using the ECO MODE should help to keep your percentage of loss of MPG to a minimum.
     
    1 person likes this.