Acu-Rite sells thermometers that talk to a base station that is connected to your internet. All for under $100.
You can watch the temperatures on your phone while you are down here. If it seems that the temps are not holding 62 (or whatever), you can ask someone to go check your house.
Then use the same setup down here while leaving the A/C at 80 degrees, when you head back up north.
I also have a couple of wifi cameras. Between the temps and pix, you have a good sense of what is going on in an unoccupied house.
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