I'm shipping overnight shipping a ball python on Monday and was wondering if i should use a 40 hour uniheat pack or not. Its not shipping very far, only from Arlington, TX to College Station, TX. On Monday at my end the high/low temps are 62 and 45 degrees fahrenheit. At the other end on Monday the temps will be 67/53 and Tuesday will be 65/41. The package should be delivered around 12:00 pm on Tuesday so it won't see the 40 degree weather.