Best way to get the temperature from afar in a rental

[Dominick Marschall]

Hello, 

This may be a dumb question, but I have a rental about 45 minutes away and it is vacant. I live in the north so freezing pipes are common. Do you know of any ways I can get the temperature of the inside of the building without installing a nest or similar?

I was thinking a wi-fi thermostat but I cannot find any good ones. Or does anyone know of any other tricks? 

Obviously the furnace is on, but I'm just afraid it will stop working and I wont know for a week or two. 
Thanks,