Pretty much every person who says they have a system or secrets to sell you to make you a success is a fake.

When you say oil heat, is this a hot water system/boiler?

Look into a ductless mini-split system.

If you need new central ac/heat system that will add $4-5K more.  

That makes it difficult to set up and maintain a system.

Every manufacturer is rushing to change over to electric, so clearly they are seen as a threat.

And the local utility company won't do things like energize  new panel box or turn on a new HVAC system without seeing the approved permit. 

Had success with our other STRs and have some strong systems in place.

Roofing - understanding how roof systems for your area work/are put together, also gutter systems12.

Makes it difficult to get accurate value because of small sample size.Some infoLocation, affluent west shore suburb of Harrisburg, low crime,  family oriented neighborhoodRanch style, 2400 Square Feet total, everything updated by hvac system (works fine)Each unit has 2 bed 1.5 bath, one is 1400 sq other is 1000Rent is 1450 one side, 1500 the other, renters pay all utilitiesInsurance, maintenance, and yard upkeep total 3000 a yearGood renter clientele, most are doctors or nurses, close local hospitalsBoth have separate driveway and yard  Located in well of neighboorhood in low tax hampden township, taxes are 3500 a yearThe duplex was grandfathered, out of the 400+ houses in the  development, there are only 5 multifamilies. 4 houses down the street sold for between 380-400k in the last 4 months.