Renters may complain that they can't get comfortable - and it is probably because the humidity remains high in the structure.If you are upgrading to sell, then the appraisal will have more of a bearing on your decision.My suggestion - talk with your contractor and get all the pros and cons of each system.

How long do you want your money tied up for?

The term and interest rate remain the same, it just amortizes over 20 years at that point.This can be done for annual lease properties as well as short term rental properties like AirBnb.

We are in a rural area so no lenders are doing hard money cash loans (so we wouldn’t tie up all our cash in this purchase).

Then solidify your RE investing goal (dont want to get tied up in a property that doesnt fit your goals).

I'm almost certain this would count as practicing real estate especially if your pay is tied to the deal closing. 

If you take out the land value, the remaining amount should be an estimate of the depreciated value of the house (ACV).  

I recently sold my townhouse and made about 90K and am ready to invest on my first multihome (Florida market, planning on self managing as I am just starting out) Should I put down 20% down to make more profit (no pmi) and later on get a heloc to reinvest in more properties or use the fha loan for 3.5% down, I am thinking of house hacking at first and use the remaining money to invest in a couple more properties (less profit due to pmi)? 

Remaining HOA lien5. 2nd mortgage etc.

@Connor Thornsberry house hack and then buy a 4+ family with the remaining money for down payment.