Depends on the insulation, size of the house, how you set the thermostat.

Currently, I have a few smaller projects on a couple of houses: carpeting/tiling floors, painting walls that contain LED paint, installing A/C and heating system, installing light fixtures, installing appliances, making sure electrical wiring is safe, installing recessed lighting, insulating/waterproofing medium size room in the basement.

Need to make sure insulation is solid in attic, and your CFM and btu/hr is high enough to handle the head pressure it has to supply to push that air up that much vertically. 

There is no insulation between properties in these old buildings.

I have seen people miss many obvious things (drywall, insulation, HVAC, etc) and they were costly lessons.  

The tenants pay for the oil, and I give a bit of a rebate back to them on the cost as I do know its a bIt more expensive - though some of that could also have to do with a poorly insulated house.

I'm approaching this whole project as a big learning opportunity, to develop a skill-set I can use for future projects.I have a lot of fun plans for the garage of this property, which is huge, insulated, and has a bonus room, as well as a good structure for a garage-top deck. 

We've been working with Merrimack Savings Bank because we participated in the NH Energy Program and got an insulation grant from the state that MSB sponsors.

https://www.cpwr.com/sites/default/files/training/...When I was 14 my dad bought a warehouse that had asbestos insulation in the offices and I remember removing wooden creosote bricks with my bare hands and breathing in the foot of dust when we were cleaning the warehouse out.

House is in need of the following capex items soon....Roof/Gutters/Insulation and Third Electrical curcuit box (Common area).If I used a Heloc to fund the capex items it would take 4 yrs of investing all cash flow into paying of the Heloc.