The mini-split system will be your priciest option and has a decent amount of maintenance to keep it running at peak efficiency, but has lowest cost of operation. https://www.energysmartnola.info/home-ownersYou can find contractors that participate in the program on the website.

Yes, parts of New Jersey are expensive, however those locations also generate higher rental income.

So you install a furnace, A/C system finding out your permit application (~$1000) is denied to operate but you installed the new systems.

I started with turnkey operations and I recommend that if someone doesn't have time to do the leg work.

Old wooden windows with lead paint on them generate a lot of dust when opened/closed. 

Also there is a lot of risk and liability operating a care center.

So no buying and holding with local operation and physical property.Let's pretend I form this corporation in Wyoming.

My main focus right now is rental property; something to generate some steady income.

As you start generate some success please take the time to give back to these communities which you are working in. 

I would use that money to fund BRRRR deals to turn into rentals or rehabs to generate cash for rentals.