Windows are drafty etc and heating through out the house is very Inconsistent. 

Only these type of requests (water leak and no heat are urgent) and then you should text/call (your preference).

So I analyse each property individually, looking at major features like roof, heating, cooling, hot water, anything likely to break down really. 

Or is the landlord always responsible for the water bill and heat?

I knew what was wrong with the unit, the fan on the coil would not run, so I hooked up an external fan on top of the unit to pull air through the coil and we had AC.  

The heat is problematic.

Last week this tenant casually informed me by text that he had hired a heating guy to service the furnace of the building that is in his half of the duplex.

It blows colder than 80, but sometimes during extreme heat it AC's can malfunction due to the maximum capacity it's working tech said the AC will over heat in extreme heat.

What's important is secondary security locks, AC/Heat for all living sq footage, all working outlets, damp rated bulbs in bathrooms, working appliances, fire extinguishers, we do 1 year worth of monthly air filters, which cost way less than ceiling fans, working fire alarms, etc.Best wishes, good luck.

Does the garage have proper firewall protection and heat alarms for whoever is sleeping there?