Last year in late July three of us drove from Houston to Buffalo, stopping along the way at quilt shops. I was worried about our machines locked in the hot car as we made our visits to LQS on the way so I called the dealer/service shop that I use. They told me that their machines are stored in warehouses and that the temperature got much higher than what I was concerned about so I should not worry. You can imagine how hot it would get in a warehouse in Houston. We had no problems (other than too much fabric to buy).