Can’t decide on how to set HVAC

I was talking to our one son, who is a truck driver.  He was going through a blizzard in the middle of Arizona.  He said he had several inches of snow on his truck, and he had driven several miles in the last hour.  He had his television on, and he was drinking a cup of fresh coffee. He was bragging that he had the best HVAC system you could possibly have in a truck, and it was all in the front of his cab. I had to laugh, because he lives in the south where almost everyone panics if it gets below sixty. He told me that he had to buy a space heater to keep his feet warm.  Now he is too warm, and his feet are dripping with sweat. The poor, finicky guy just can’t get comfortable. He is resting in his truck, in shorts and flip flops, and bragging about his HVAC system. He called me a couple of hours later, when he got to California. He said that the temperature had already climbed to just under sixty and he was ready to turn off the heater.  Tomorrow, he is to be somewhere else, where the average temperature is supposed to be about eighty. Now it’s his a/c that will come in handy. I’m not sure if I could handle such temperature changes where you need a heater and a space heater one day, and the very next day you have the air conditioner blasting. I could never be a truck driver or anything that would take you through so many weather conditions in such a short time. Next week, he will be back home, and I’m sure he’ll be swimming in his pool, and he’ll have forgotten all about the snowstorm and his amazing heater.

HVAC unit