Gerald Deux

Mine has been all over the place. I purchased the vehicle in warm weather and the range was consistently 30 - 31. However as SOON as it got cold outside (20's overnight, low 40's during the day), the range dropped to 25. I am not sure why as I do not use the heater. I only use the seat heater and steering wheel warmer (and wear gloves.) The vehicle is garaged overnight.