Also manufacturer said these floor needs 65-85 F temperature - so if there is vacancy in the winter, the house temperature needs to be set at 65 or higher?

We had a single guest complain that the rental was horribly cold so we put a note that the temperature of the unit is 68 degrees.

Google says the average high temperature in the summer is 104-106, which surprised me.

And good timing...the weather is about to break in the Midwest...so the temperatures will feel like home (maybe....)Best of luck in your search. 

He's constantly complaining that he can't afford the vendors I'm sending over but I'm sending them over to deal with water leaking from toilets, water leaking through the roof, frozen pipes, furnaces going out when the temperature is -15, no hot water, sewage backing up into showers and sinks, etc.

It also monitors the temperature for me, which is great in MN.

Here in MN my biggest worry is the furnace going out and freezing up the house, so I have the temperature sensor and a motion sensor.

It seems to me that when the word "Nuclear" is mentioned, people lose sight of the real issue at hand, which is the raising of the mean temperature caused in no small part by increased CO2 levels.

It seems you have a heat pump and if you use emergency heat either because of low temperatures or a problem with the heat pump there is a  higher cost because it is basically  resistance electric heat, not the more efficient heat pump.

I've changed the thermostat for upper unit but the tenant can't adjust temperature.