The tenant with the thermostat must be told - in writing - that the temperature should stay within a certain range to ensure the second tenant gets the appropriate amount of heat.You can also look into installing a "smart thermostat" like Ecobee and setting limits to the hit so tenants can't put it above/below certain threshholds.

Duplexes are typically covered by the state wide rent control law.  

I don't know the stats of houses you are thinking of buying but it needs to rent at the maximum of that range or you need more down payment, also assuming there is no HOA cost.

What price range are you looking at? 

On top of my restaurants, we both work full time jobs and share a mid range 6 figure income.

I just bought a condo on St Aug Beach, and SFR on the beach is way out of my price range, and maintenance at the beach is huge for SFR.  

I was not aware there is any $ to be made in that range.

Or it is out of my price range.  

Hello All,I am new to RE investing and am trying to find help online with Multi-Family investing and I find several courses ranging from $3000 to $15000.

I don't know if this is considered upstate, but all the properties cash flow and he has picked them up between 100-150k price range.