For example,  I had a bathroom redone, I also had our front iron railing fixed (new feet welded in, cleaned and painted) and resurfaced the cement steps, and some landscaping.  

my temperature gauge says yes, def cooling in east tennessee

Does anyone in this part of the country where the humidity and temperature is high, have these mini splits?

Your lease probably does not address a minimum temperature she should keep the house, but going forward you should.

Insulating pipes is rarely going to prevent frozen pipes when temperatures get very low; a source if heat is the only real solution when temperatures get low like when the “polar vortex” occurs.

More cost effective, if someone time consuming, would be to change the most vulnerable pipe to high pressure PEX; I've seen demonstrations of PEX expanded absurdly beyond its size, with pressure and temperature, before busting.

Talk to some mortgage guys and get the temperature on that right now.

Floating snap lock floor is floating so it moves and temperature differences will make the noise more noticeable.  

I can save money on electricity when no one is there and monitor temperatures to make sure I don't see one of my HVAC units struggling so that I can arrange for service before there is a failure.

I am in Oklahoma where temperatures are often 100 + in the summer.