I can give you some general info on insuring the property:Here are some things to look for from an Insurance prospective: Any in-ground tanks (active or inactive)Any Knob & Tube or Aluminum WiringIf built before 1978, does the building have Lead Safe certificationsAny wood stoves or secondary heating units.

I'm also out of public accounting and I'm a senior accountant for a property management company who is affiliated with a real estate brokerage, high end construction company, and a plumbing & heating company. 

Also, the landlord pays about $360/month for heat.  

I don't know the peak vacation time, although I know a lot of people from Phoenix come up in the summer to escape the heat.

Also, in our research, it looks like car insurance, city/state tax, and heating an older home in the winter are costs that we really have to consider when making the move.  

No electrical or plumbing or heating in that room. 

I'm trying to find the most economical cost for heating & providing hot water for the second floor unit which is 588sq ft, has R30 in the attic which is the ceiling of the apartment, no wall insulation, has 3 external walls, 8 single pane windows with storms, and the floor will most likely be heated from the apartment below.

Also looking for someone that knows HVAC as I will need to replace my heating with a central A/C and heating units.  

I'm considering moving to Seattle (for personal, not investing reasons) but I wouldn't want to abandon RE to do it, and the heat of that market is a bit intimidating.

I don't know much about oil heating but here is the same discussion:https://www.biggerpockets.com/forums/742/topics/488598-oil-to-gas-utility-conversionI bet the inspector would have some thoughts on it too.