I can't tell you exactly what temperature it will be tomorrow, but I know it will be warm :)

Another thing is the contractor doing the work should have a tool to look at the wall and identify possible areas where there is a temperature differential where the insulation may have a void so they can go back and re-fill it if needed.

@Osazee Edebiri I wonder if that is what we call a "limiting believe" - I have rented units in Jannuary in Milwaukee - with a foot of snow on the ground and temperatures around zero.

I am native to Spokane WA, where I have built a mobile welding and fabrication business, which I have used to fund my real estate business.

The AC unit has a smart thermostat that allows them to adjust whatever temperature they would like (the smart thermostat is located in their unit).

Put it in my truck, brought it home and now I'm cleaning it up, doing some butt welds, and repainting it. 

You should be able to automate a switchover with some sort of temperature sensor which triggers shutoff.

It would be unlikely that you could get an attic space hot enough from lack of ventilation to melt outdoor siding, because that would be a ridiculous inner surface temperature that might ignite anything combustible in the attic. 

Because, when I show the unit to prospective tenants, I want it to be a comfortable temperature (a/c or heat on), rooms lighted, and that everything is functioning.  

I have a job making 52,000 a year welding 60 hours weekly.