He got ~$30k off asking price, three new heating systems, and the seller even kicked in cash towards closing costs, which included buying down the mortgage interest rate.

Strong cash-flow market from what I'm seeing in the proforma, and the trulia crime heat maps don't look too bad- but I'm reading a lot of negative things about the area itself.

Heat bills weren’t that bad through the winter duplex gut in which it was heating 2 units and the outdoors (think broken windows and zero insulation.)

Electric was already there and then heat was electric.

Issues will come up; heat/AC, hot water heater, etc. 

Instead of replacing these two units, should I just combine it (per se) and get a High Efficiency Heat pump?

I am looking into my first property a tri plex and want to know what issues/ situations I should be foresee with having only access point to the heating , meters , furnaces is through a legal basement apartment .

One unit is 750 sq. feet and has two bedrooms, one bathroom (note: the bathroom is located via one of the bedrooms), propane heat, small front porch and side yard.

Have an Air Conditioning or Heating guy come in and look to see if it's the AC/Heat.

Further, the effects of sunlight, heat, and humidity on viral survival all serve to minimize the risks outside.