They'd removed the thermostat batteries for their remote control.

Also, it would be good to take a photo of the thermostat setting of the upstairs tenant.

The ice has now all melted, the thermostat went bad, had to be replaced.

Running on a thermostat setting of 60 deg F the electric bill went from the minimum billing of $24.65 to $73.65 for 29 days, or effectively $1.63/day.

But you have to factor in the turnover costs, daily up keep, if you'll going to install wi-fi thermostat, welcome guide provided to guests prior to check in.

The house was built in 1971 with heat strips in the ceiling as a means of heating the house, with separate thermostats in each room.

Although my house is well insulated, with a pitched roof and an insulated attic, and I set my thermostat such that it's 80 degrees during the day when no one is home, and 76 degrees in the evenings.Her building has three units, her unit is an end unit, facing south. 

The Act requires all newly constructed multi-family dwellings of four or more units intended for first occupancy after March 13, 1991, to have certain features: an accessible entrance on an accessible route, accessible common and public use areas, doors sufficiently wide to accommodate wheelchairs, accessible routes into and through each dwelling, light switches, electrical outlets, and thermostats in accessible location, reinforcements in bathroom walls to accommodate grab bar installations, and usable kitchens and bathrooms configured so that a wheelchair can maneuver about the space.Developers, builders, owners, and architects responsible for the design or construction of new multi-family housing may be held liable under the Fair Housing Act if their buildings fail to meet these design requirements.

so a $90 service all and an $80 capacitor fixed well over 1/2 of most issues.There are lots of issues that aren’t even that complicated… Batteries in the thermostat going dead, drain lines, getting clogged with dirt and goo, drip pans that get full from the unit sweating too much or not draining properly, bad thermostats, etc.Occasionally, you will get either a leak, or a bigger part that goes bad that will cost in the $200 to $500 range… fans and motors going out, etc.Home warranties are worthless… they will take 3 weeks to fix your AC.  

Believe it or not, we had to add the following to the Schedule 'A' (House Rules) of our lease:The Tenant agrees not to park in front of the building entrance, on sidewalks or to block access to sidewalks, buildings or parking areas;The Tenant agrees that prior leaving on Christmas holidays or spring break the heating system will be left active with thermostats set no lower than 10C (50F) and all windows will be closed;