A quick conversation with whichever municipal employee makes that call should give you some good insight as to whether it's worth pursuing.

You can borrow 50% or 50k, whichever is lower, from your 401k with no tax implications.

I believe this is deferred until the investment is sold or 12/31/2026, whichever comes first.

They will go max $100k or 70% LTV whichever is lower.

the fannie mae rule is75% of ARV or 100% of HUD whichever is lower.so when you buy a house with cash, the HUD is what you paid for the house.

Modern, direct vented, natural gas and propane furnaces are typically in the range of 92 - 95% efficient.Your decision on whether to replace the furnace will depend on the efficiency of the current unit and whether it make more business sense to replace the furnace or to add a heat-pump with an exchanger insert to the existing system ... and, it is (or should be) primarily a mathematical decision yielding which ever approach is going to offer the shorter payback and lower operating costs.The math aside, there will be other non-math factors.  

Best of luck, whichever way you decide to go.  

Whichever you use in your state.

There are a lot of meetups for local investors so I would strongly encourage you to start attending whichever is most convenient for you. 

As to HOA debts/liens when the bank buys it back at their own foreclosure auction.....the bank is protected by the Safe Harbor statute passed in 2008 I believe.....they owe only 1% of the original mtg or 12 mo.s of dues, whichever is less, and the HOA has to accept it as full payment.