You can do the same with forced air but it's probably more difficult and expensive.I think you should wait for it to be a problem before stressing about it.

To add laundry to the other units I don't believe the space will allow in the unit, but possibly adding a solution in the crawlspace which is tall enough to stand or adding a 3rd small building with it's own split unit for heat and air.

I was planning on having 1 air handler in the open living room and kitchen area.

Looking at Air Bnb we could get up to $1500 for a home game weekend.

I also talked with him and he wants to work out a deal where I manage the entire park for him for 15% of the gross income ($469K last year), and convert all the park owned to tenant owned homes (he wants to do this).The $5k/month with the actual land owners (also 75 years old) wouldn’t start until the current land-lease is up, so my expenses for the next 7 years would be zero, I’d essentially be managing & improving the park that I’ll eventually own.If I went for this deal, my plan would be:Get it under contract with actual land owner, air-tight where he nor his heirs can back out of the dealThen get a deal worked out with the current lessee to manage his park for 10-15%Convert all homes to rent-to-own (rent credit, etc)Gradually raise rents to marketThe fruits of my labor won’t come into effect for 7 years, but then I’ll be cashflowing like a beast for the next 20 years since $5K/month won’t even be 1/3rd of what actual bank financing would cost.

It could be Air BNB

Less your $70,000 repair costs is $247,000.Your repairs include things like central air.

At $1650 you are talking 3 bedroom 2 bath, parking, central air/AC and laundry facilities.

My plan is to place a reflective thermal barrier on top of the existing cool coat roof, then add 2 x 4 furring strips for the needed air gap and then 26 gauge sheet metal roof overhanging the eaves by 12" so rain will run off the side away from house, not down the side of the house. 

They've complained about the upstairs bedrooms being hot and minimal air flow.