He has recently started doing personal jobs on the side but is new to the business part of it.He went to a unit and replaced an outdated thermostat, fixed a light fixture that was hanging, and sprayed WD-40 into the units entrance lock because it was giving the tenants some trouble.When we got the invoice, he charged for 45 minutes of labor but also charged an extra $30 for additional fees and had no further description.

(Note:  the thermostat was in a locked box set at 69 degrees in a different apartment.)I asked him why the window was open when it was 20 degrees outside. 

All things not working on move-in:A/C unit for upstairs broke in 115 degree Vegas heat, fixed in 2-3 daysCould not change temperature of thermostat, it was pre-programmed and controlled remotely, months to fix No internet, after we spoke numerous times about us working remotely from the home via the internet, added next dayNo garage door opener, 2 weeks to getNo heat (yes we need heat in Vegas), took weeks to fixShower in 4th bath did not work, months to fix but wasn't urgent as we were not using it No dishwasher, still not fixedWhile everyone has tried it has been a huge inconvenience with all the repairs and the dishwasher has never worked and still doesn't.

Wifi allows me to monitor the place using cameras, I have a wife controlled remote thermostat, and soon an alarm.4.

It has one furnace and one thermostat in the down unit that controls the temperature for the entire house-both units.

You might want to put a timer on the thermostat that turns it up and down depending on time of day or charge them over and above a certain amount of usage. 

That way, you can just give 30 days notice to end a tenancy, as well as 30 days notice to change any rules, etc.The things that usually wreck roommate situations is unwanted guests, not cleaning up after themselves, messing with thermostats, stealing food.Some of those things can be pretty easily dealt with - like including a weekly cleaning service in the rent, putting little apartment fridges in the rooms.But, inevitably, there will be a roommate who you will want to get rid of, so having month to month agreements is the easiest way to get rid of them.  

If I plan on doing anything that would inconvenience them (paint the porch, replace sidewalk) I let them know 'way in advance.Twice a year, I change all the smoke/CO alarm batteries & double-check the thermostat batteries.

Ended up they had 2 bad dryers, one with a dead thermostat one with a dead heating element. 

Maybe a smart thermostat or something.Do not let tenants dictate your upgrades - they sound like a PIA, honestly.