About once a month I get a phone call that the heat isn't working correctly, not reaching the desired temperature.  

.- Set thermostat back to certain set temperature- Lock house and return the key to the lockbox (if needed)Any more than that and I think you quickly run into the "Well why am I paying for housekeeping services then?"

In my area it is common for landlords to pay for heat which promotes a lot of abuse with the system in that tenants keep the heat at unreasonably high temperatures and often open the windows in the dead of winter when it can be -20 out.

Let's just hope none of your tenants read your response and figure out what a pushover and easy target you are.Not aware of any laws in Chicago or Illinois that require a landlord to provide a property with a MAXIMUM temperature.

- If you are sharing Heat/Air with your tenant, how do you handle temperature adjustments?  

Do you have a set temperature limit?

Instead of "ceiling fan" in the description highlight "the cool breeze provided by the energy efficient ceiling fan creates the perfect temperature for getting a good night's rest". 

The best way I have found to avoid this is if you have the skills, weld a new cage on yourself.

They're inexpensive like a rubber roof, but the seams get welded so it's very durable like a PVC membrane.

My GC primed and painted over them a few times thinking they were just old, stubborn stains that needed extra product, but they kept coming back after each rainfall.I hired a water intrusion detection company to help me pinpoint the problem - they said the new roof seemed solid and that based on infrared and temperature readings, the moisture is coming in from the partition walls.