Things like a roof, air conditioner will run you big money.  

I'd definitely say you need to plan on additional expenses upfront such as: permitting fees, extra holding time if there are permitting issues, all the little things in the drawers and kitchen etc, hot tub, amenities such as toilet paper, spices, laundry detergent, dish soap, shampoo and conditioner etc. - stuff you need to restock and have on hand.

It'll remove heat from the air in the house to heat the water- so it'll function somewhat like an air-conditioner/dehumidifier, something that will be welcomed in about 9 months out of 12 in Florida, and it uses less electricity than an electric resistance heated water tank.I'm not sure whether or not you'll be able to recoup the added expense in a flip- the stove is very visible, so likely more important than a heat pump on a hot water heater. 

HelloI am looking to replace the AirConditioner 3T 14 CR or above in one of my properties. Any local experts that can suggest a reasonable and efficient company? If you have worked with them in past, even better.What ...

A pool you can live without, but imagine a furnace, air conditioner or refrigerator!

Worse yet, if a tenant gets angry with you, they'll simply turn the heat all the way up (or the air conditioner all the way down) and open the windows and doors.

And then removed the air conditioner.

The snakes showed up under the air conditioner at a guys house .25 mile away. 

There are a lot of ways to manage out-of-market/state properties; the PM model may not be the most efficient.in many areas air conditioners are stolen at frightening regularity..  

Senville LETO Series Mini Split Air Conditioner Heat Pump, 12000 BTU 208/230V, Works with Alexa, White https://a.co/d/dsFMYL5